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F.1 Roman Symbols

Symbol Explanation

area

area of primary mirror

area of aperture

aperture

generic constant

$A_{0}(t_{1},t_{2})$ offset of linear regression in the reset interval correction

$A_{1}(t_{1},t_{2})$ slope of linear regression in the reset interval correction

$A_{0}$ , $A_{1}$ first order correction on point source spectral response function

$A_{0}$ , $A_{1}$ first order signal corrections for PHT-S chopped observations

$A_{0}(i)$ , $A_{1}(i)$ coefficients for signal dependent PHT-S correction

flux density conversion factor

$A_{chop}$ empirical asymmetry factor for chopper offset

coefficients for chopper offset correction

surface brightness

mean brightness

$B_{back}$ background surface brightness

$B_{n}(i,j)$ accumulated sum of first n sky measurements to

mean brightness

generic constant

$c_{light}$ speed of light = 299792500 ms $^{-1}$ in OLP

generic constant

generic constant

$C_{1}$ , $C_{2}$ constants

statistic

$C_{int}$ detector capacitance

$C^{det}_{int}$ idem for detector

C1 $^{f}$ constant for transmission of the whole optical path for a given filter

assuming $\nu f_{\nu}=const$ as reference spectrum.The effective size

of the primary mirror; reflection losses, filter transmission, spectral

response of the detector, etc. are included

spectral response function for pixel i

$C^{c,p}_{avg}(i)$ average spectral response function for a point source

$C^{c,p}(i)$ spectral response of pixel i for a point source p corrected for chopped c

signal losses

$C^{c,s}_{avg}(i)$ average spectral response function for PHT-S staring observations

$C^{c,p}(i)$ spectral response function for pixel i corrected for chopped signal loss

$C^{c,p}_{ave}(i)$ PHT-S averaged chopped spectral response function for a point source

$C^{det}_{int}$ integration capacitance associated with detector P1, P2 or P3,

$C_{phts,pixel}$ point source responsivity for PHT-S pixel

$C^{E}_{phts,pixel}$ extended source responsivity for PHT-S pixel

height of source peak (background subtracted)

$d_{airy}$ diameter of Airy disk

$D_{A}$ diameter of aperture for PHT-P, side length of the array for PHT-C

Dec declination

DI selected offset data word (0...4095)

$D_{0}$ fixed voltage offset for CRE

exposure time

e $_{n}$ (i,j) contribution from nth sky sample to exposure time

accumulated exposure time

$E_{n}$ (i,j) sum of first n sky pointings

$E_{total}$ (i,j) total exposure time of image

filter

$f_{\nu}$ flux density

$f^{f}_{PSF}$ point spread function fraction for filter f

entering the field aperture in case of PHT-P or falling onto the

array in case of PHT-C

$f_{PSF}$ intensity function of a point source entering the aperture

$f_{PSF}(\lambda_{c}, aperture)$ fraction of the telescope point spread function falling into a given

aperture for PHT-P or onto the full array for PHT-C

$f^{aperture}_{psf}$ idem for a given aperture

$f^{array}_{psf}$ idem for the entire detector array

$f^{pixel}_{psf}$ idem for a given pixel

$f_{psf}(\lambda_{ref})$ fraction of point spread function at the reference wavelength $\lambda_{ref}$

$f_{beam}(\lambda)$ wavelength dependent beam profile

inside the aperture or pixel

$f_{cov}$ coverage factor

${\char'13}(i)$ flat-field correction for pixel

flux density in frequency units unless explicitly specified

$F_{\nu}$ (i,k) flux for pixel i at raster point k

$F_{scr+back}$ source+background flux

$F_{on}$ source+background flux

$F_{back}$ background flux

$F_{off}$ background flux

$F_{scr}$ source flux with psf correction for point source

$F_{\lambda}$ (i) flux density in wavelength units for pixel

$F(\lambda)$ flux density of source at specific wavelength $\lambda$

$F^{f}_{\nu}$ source flux density for an assumed spectral energy distribution

$\nu f_{\nu}=const$

(flux density at reference wavelength)

$F_{\nu}(\lambda_{c})$ flux density at centre wavelength of filter

$F_{\nu_{ref}}(SED)$ flux density for applied SED

$F_{\nu_{ref}}(\nu^{-1})$ flux density quoted in AAR

$F(\nu)$ flux density in frequency range

$F(\lambda)$ flux density in wavelength range

$F^{f}_{\nu}$ source flux density for an assumed spectral energy distribution

$\nu f_{\nu}=const$ at reference wavelength

weighting function for correction $\phi$

weight factors related to correction $\varphi$ (i,S,t)

$g_{fit}$ goodness of fit

gain

$G_{off}$ offset gain

$G_{signal}$ signal gain

Planck constant

heating power of FCS

linearisation correction for signal S

$H^{f,i}(s)$ idem, for filter , detector pixel , and signal

pixel index, integer counter

Surface brightness in wavelength units unless explicitly stated

$I_{\nu}(\lambda_{c})$ surface brightness based on monochromatic point source flux density

$I^{f}_{\nu}$ surface brightness of (extended) source in filter f, assuming

$\nu F_{\nu}=const$

$I_{\lambda}$ (i) surface brightness of a given detector array element i (of PHT-S)

IBP in-band power in W

$I_{step}$ step flag, for chopper position within a chopper cycle

integer counter

chopper cycle number

raster point number in one direction

Boltzmann's constant

$k_{f}$ colour correction

constant

$K_{CC}$ (SED) colour correction factors for applied SED

length or integer counter

raster point number in one direction

length

$L_{\alpha}$ map size in RA

$L_{\delta}$ map size in Dec

$m_{pix}$ mean pixel value used to convert into the correct units

number of raster steps along a raster leg

median of s $_{diff}$ per chopper unit

number of columns of raster

n integer counter

n $_{\alpha}$ minimum number of image pixels in RA to cover raster area

n $_{\delta}$ minimum number of image pixels in Dec to cover raster area

n $_{d}$ index representing the dwell time in the calibration files

n $_{pix}$ number of detector pixels

N integer counter

$N_{it}$ number of iterations for ramp deglitching

$N_{min}$ minimum number of readouts per ramp

$N_{\sigma}$ sigma value to identify outliers in ramp deglitching

$N_{u}$ number of chopper units

$N_{r}$ number of ramps per chopper plateau

$N_{read}$ total number of readouts

$N'_{r}$ actual number of ramps per chopper plateau in the telemetry, is derived

from N' $_{r}$ = N $_{r}$ /DAT_RED where N $_{r}$ is the commanded number of

ramps per chopper plateau and DAT_RED is the applied data reduction

factor

$N_{fg}$ number of fine grid positions that fall within the detector footprint

$N_{total}$ total number of fine grid positions that fall within a pixel

$N_{cc}$ cirrus confusion noise

$N_{gc}$ galaxy confusion noise

power in W

$P^{f'}_{fcs}(h)$ in-band power for filter f' and FCS heating power h in mW as obtained from

FCS power tables, for PHT-P in Wmm $^{-2}$ ,

for PHT-C in W/pixel

$P_{src}$ source power

$P_{C}$ power measured on pixel if line is centred

$P^{1}_{C}$ power measured on adjacent pixel if line is centred

$P_{M}$ power measured on pixel if line is centred between pixels

$P^{f}_{fcs}$ (h) in-band power for filter f and FCS heating power h

$P^{f}_{cal}$ in-band power of celestial calibrator

$P^{f}_{scr}(a)$ in-band power for filter f in aperture a

$P^{f}_{scr}(i)$ in-band power for filter f and pixel

$P_{max}$ maximum commandable power on FCS

in-band power of on-source position

in-band power of off-source position

in-band power of source only

$P_{gauss}(s)$ peak (source) power value

$P_{gauss}(b)$ background power value

$P_{fcs}(f,h)$ in-band power on the detector from the FCS due to heating power h

$P_{target}(f')$ in-band power obtained from the source

$P_{fcs}(f,h)$ in-band power for given FCS heating power h

constant

detection limit in multiples of $\sigma$

quaternion

$Q_{raster}$ quarternion that defines the position of the PHT central field of view for

a given raster point in the J2000 inertial frame

$Q_{str}$ defines the J2000 pointing of the ISO star tracker

$Q_{r}$ defines the raster point relative to the raster centre of the scan

$Q_{str/qss}$ describes misalignment between the star tracker and the quadrant star

sensor (QSS)

$Q_{qss/pht}$ describes the QSS to instrument aperture alignment

$Q_{cor}$ gives the fine pointing correction to the star tracker calibration

quarternions representing the rotations of the detector origin with

respect to a given raster point, assuming perfect alignment between

chopper and spacecraft y-axis

$Q_{chop}$ chopper quaternion

constant

responsivity

$R_{c}$ average relative system response derived from a bandpass

$R_{det}$ detector responsivity

$R_{det}$ (i) detector responsivity of pixel i

$R_{default}$ default detector responsivity

responsivity for each pixel of a C detector

$R_{FCS}(i)$ responsivity of pixel obtained from FCS

$R(\lambda)$ system response at specific wavelength

$R_{s}$ sensor resistance

constant in resistance

$R_{k}$ harness resistance

$R_{p}$ EEU shunt resistor in parallel to sensor

measured responsivity of pixel relative to default responsivity

signal in V/s

$s_{src}$ source signal

signal at time t

pairwise differences between V(k) and V(k+1)

slope for ramp j

$s(RI, DAT\_RED)$ signal taken with reset interval RI and data reduction rate DAT_RED

$s'(\phi(t))$ signal after orbital dependent dark correction

$s(\phi(t))$ initial signal

$s_{dark}$ ( $\phi$ (t)) orbit dependent dark correction

$s_{old}$ signal before signal linearisation

$s_{new}$ signal after signal linearisation

signal

average of valid signals per chopper plateau

$s_{diff}$ difference signals of consecutive readouts

generic pattern

$s_{scr}$ source signal determined via generic pattern

$s^{c}_{scr}$ source signal determined via generic pattern, corrected for losses due to

chopper modulation

$s_{k}$ (x) source signal for chopper cycle k

$s_{k}$ (X) given set of powers

$<s_{fcs}(f)>$ weighted mean signal for FCS measurement

$<s_{fcs}(i,f)>$ FCS signal per chopper plateau

$s_{pixel}$ image pixel size

nominal uncertainty of fit

uncertainty of fit

signal

$S_{src}$ linearised difference signal (from chopped measurement)

$S'_{src}$ linearised difference signal, corrected for losses due to chopper

modulations

$S_{on}$ , S $_{off}$ on- and off-source signals

signal for pixel i at raster point k

$S^{f}_{cal}$ measured signal of calibrator

$S^{f}_{str}$ measured dark FCS signal (stray light)

$S^{f'}_{fcs}$ signal of FCS measurement in filter f'

$S_{scr}(a)$ linearised source signal (PHT-P) after dark signal subtraction

$S_{scr}(i)$ linearised source signal (PHT-C) after dark signal subtraction

signal transient of pixel i at time t

$S^{det}_{dark}$ orbit dependent dark signals

size

$S_{fine grid}$ side length of (square) fine grid image pixel

$S_{pixel}$ side length of square detector pixel

time in s

$t_{mid}$ time at midpoint of a given ramp

$t_{0}$ time at first readout of a given ramp

$t_{dwell}$ chopper dwell time

$t_{m}$ measurement time

$t_{r}$ reset interval time

$t_{plat}$ chopper plateau time

$t_{n}$ dwell time

temperature in K

EEU temperature

$T_{refl}$ reflection losses on optical elements

tmd telemetry data value

$tmd_{max}$ maximum value of telemetry word (=4096)

TOL voltage for chopper deflection calibration

RA right ascension

chopper unit

uncertainty

$u_{n}$ (i,j) mean brightness uncertainty contribution from nth sky sample

voltage in V

$U_{ACF_{1}}$ voltage for chopper deflection calibration

$U_{DCF_{1}}$ voltage for chopper deflection calibration

$U_{OF_{1}}$ voltage for chopper deflection calibration

$U_{OF_{2}}$ voltage for chopper deflection calibration

$U_{CRE}$ CRE output voltage

$U_{off}$ GAIN $_{1}$ dependent offset voltage

uncertainty

$U_{n}$ (i,j) accumulated mean brightness uncertainty

$U_{rms}$ (i,j) brightness uncertainty from rms

voltage in V

voltage corresponding to readout k

$V_{ini}$ voltage

weight

weight function for PHT-S chopped measurements

$w_{j}$ statistical weight of each signal obtained from its associated statistical

uncertainty

distance or coordinate

$x_{m}$ margin around raster in m direction

$x_{n}$ margin around raster in n direction

$x_{0}$ angular x coordinate of the image pixel origin

$X^{raw}_{FPC}$ data word for focal plane chopper position

distance or coordinate

$y_{det}$ chopper deflection

$y_{0}$ angular y coordinate of the image pixel origin

distance or coordinate

$z_{det}$ spacecraft z-offset

Next: F.2 Greek Symbols Up: F. List of Symbols Previous: F. List of Symbols

ISO Handbook Volume IV (PHT), Version 2.0.1, SAI/1999-069/Dc

Symbol		Explanation
		area
		area of primary mirror
		area of aperture
		aperture
		generic constant
	$A_{0}(t_{1},t_{2})$	offset of linear regression in the reset interval correction
	$A_{1}(t_{1},t_{2})$	slope of linear regression in the reset interval correction
	$A_{0}$ , $A_{1}$	first order correction on point source spectral response function
	$A_{0}$ , $A_{1}$	first order signal corrections for PHT-S chopped observations
	$A_{0}(i)$ , $A_{1}(i)$	coefficients for signal dependent PHT-S correction
		flux density conversion factor
	$A_{chop}$	empirical asymmetry factor for chopper offset
		coefficients for chopper offset correction
		surface brightness
		mean brightness
	$B_{back}$	background surface brightness
	$B_{n}(i,j)$	accumulated sum of first n sky measurements to
		mean brightness
		generic constant
$c_{light}$		speed of light = 299792500 ms $^{-1}$ in OLP
		generic constant
		generic constant
	$C_{1}$ , $C_{2}$	constants
		statistic
$C_{int}$		detector capacitance
	$C^{det}_{int}$	idem for detector
C1 $^{f}$		constant for transmission of the whole optical path for a given filter
		assuming $\nu f_{\nu}=const$ as reference spectrum.The effective size
		of the primary mirror; reflection losses, filter transmission, spectral
		response of the detector, etc. are included
		spectral response function for pixel i
	$C^{c,p}_{avg}(i)$	average spectral response function for a point source
	$C^{c,p}(i)$	spectral response of pixel i for a point source p corrected for chopped c
		signal losses
	$C^{c,s}_{avg}(i)$	average spectral response function for PHT-S staring observations
	$C^{c,p}(i)$	spectral response function for pixel i corrected for chopped signal loss
	$C^{c,p}_{ave}(i)$	PHT-S averaged chopped spectral response function for a point source
	$C^{det}_{int}$	integration capacitance associated with detector P1, P2 or P3,
	$C_{phts,pixel}$	point source responsivity for PHT-S pixel
	$C^{E}_{phts,pixel}$	extended source responsivity for PHT-S pixel
		height of source peak (background subtracted)
$d_{airy}$		diameter of Airy disk
$D_{A}$		diameter of aperture for PHT-P, side length of the array for PHT-C
Dec		declination
DI		selected offset data word (0...4095)
$D_{0}$		fixed voltage offset for CRE
		exposure time
	e $_{n}$ (i,j)	contribution from nth sky sample to exposure time
		accumulated exposure time
	$E_{n}$ (i,j)	sum of first n sky pointings
	$E_{total}$ (i,j)	total exposure time of image
		filter
$f_{\nu}$		flux density
$f^{f}_{PSF}$		point spread function fraction for filter f
		entering the field aperture in case of PHT-P or falling onto the
		array in case of PHT-C
	$f_{PSF}$	intensity function of a point source entering the aperture
	$f_{PSF}(\lambda_{c}, aperture)$	fraction of the telescope point spread function falling into a given
		aperture for PHT-P or onto the full array for PHT-C
	$f^{aperture}_{psf}$	idem for a given aperture
	$f^{array}_{psf}$	idem for the entire detector array
	$f^{pixel}_{psf}$	idem for a given pixel
	$f_{psf}(\lambda_{ref})$	fraction of point spread function at the reference wavelength $\lambda_{ref}$
$f_{beam}(\lambda)$		wavelength dependent beam profile
		inside the aperture or pixel
$f_{cov}$		coverage factor
${\char'13}(i)$		flat-field correction for pixel
		flux density in frequency units unless explicitly specified
	$F_{\nu}$ (i,k)	flux for pixel i at raster point k
	$F_{scr+back}$	source+background flux
	$F_{on}$	source+background flux
	$F_{back}$	background flux
	$F_{off}$	background flux
	$F_{scr}$	source flux with psf correction for point source
	$F_{\lambda}$ (i)	flux density in wavelength units for pixel
	$F(\lambda)$	flux density of source at specific wavelength $\lambda$
	$F^{f}_{\nu}$	source flux density for an assumed spectral energy distribution
		$\nu f_{\nu}=const$
		(flux density at reference wavelength)
	$F_{\nu}(\lambda_{c})$	flux density at centre wavelength of filter
	$F_{\nu_{ref}}(SED)$	flux density for applied SED
	$F_{\nu_{ref}}(\nu^{-1})$	flux density quoted in AAR
	$F(\nu)$	flux density in frequency range
	$F(\lambda)$	flux density in wavelength range
	$F^{f}_{\nu}$	source flux density for an assumed spectral energy distribution
		$\nu f_{\nu}=const$ at reference wavelength
		weighting function for correction $\phi$
		weight factors related to correction $\varphi$ (i,S,t)
$g_{fit}$		goodness of fit
		gain
	$G_{off}$	offset gain
	$G_{signal}$	signal gain
		Planck constant
		heating power of FCS
		linearisation correction for signal S
	$H^{f,i}(s)$	idem, for filter , detector pixel , and signal
		pixel index, integer counter
		Surface brightness in wavelength units unless explicitly stated
	$I_{\nu}(\lambda_{c})$	surface brightness based on monochromatic point source flux density
	$I^{f}_{\nu}$	surface brightness of (extended) source in filter f, assuming
		$\nu F_{\nu}=const$
	$I_{\lambda}$ (i)	surface brightness of a given detector array element i (of PHT-S)
IBP		in-band power in W
$I_{step}$		step flag, for chopper position within a chopper cycle
		integer counter
		chopper cycle number
		raster point number in one direction
		Boltzmann's constant
	$k_{f}$	colour correction
		constant
$K_{CC}$ (SED)		colour correction factors for applied SED
		length or integer counter
		raster point number in one direction
		length
	$L_{\alpha}$	map size in RA
	$L_{\delta}$	map size in Dec
	$m_{pix}$	mean pixel value used to convert into the correct units
		number of raster steps along a raster leg
		median of s $_{diff}$ per chopper unit
		number of columns of raster
n		integer counter
	n $_{\alpha}$	minimum number of image pixels in RA to cover raster area
	n $_{\delta}$	minimum number of image pixels in Dec to cover raster area
	n $_{d}$	index representing the dwell time in the calibration files
	n $_{pix}$	number of detector pixels
N		integer counter
	$N_{it}$	number of iterations for ramp deglitching
	$N_{min}$	minimum number of readouts per ramp
	$N_{\sigma}$	sigma value to identify outliers in ramp deglitching
	$N_{u}$	number of chopper units
	$N_{r}$	number of ramps per chopper plateau
	$N_{read}$	total number of readouts
	$N'_{r}$	actual number of ramps per chopper plateau in the telemetry, is derived
		from N' $_{r}$ = N $_{r}$ /DAT_RED where N $_{r}$ is the commanded number of
		ramps per chopper plateau and DAT_RED is the applied data reduction
		factor
	$N_{fg}$	number of fine grid positions that fall within the detector footprint
	$N_{total}$	total number of fine grid positions that fall within a pixel
$N_{cc}$		cirrus confusion noise
$N_{gc}$		galaxy confusion noise
		power in W
	$P^{f'}_{fcs}(h)$	in-band power for filter f' and FCS heating power h in mW as obtained from
		FCS power tables, for PHT-P in Wmm $^{-2}$ ,
		for PHT-C in W/pixel
	$P_{src}$	source power
	$P_{C}$	power measured on pixel if line is centred
	$P^{1}_{C}$	power measured on adjacent pixel if line is centred
	$P_{M}$	power measured on pixel if line is centred between pixels
	$P^{f}_{fcs}$ (h)	in-band power for filter f and FCS heating power h
	$P^{f}_{cal}$	in-band power of celestial calibrator
	$P^{f}_{scr}(a)$	in-band power for filter f in aperture a
	$P^{f}_{scr}(i)$	in-band power for filter f and pixel
	$P_{max}$	maximum commandable power on FCS
		in-band power of on-source position
		in-band power of off-source position
		in-band power of source only
	$P_{gauss}(s)$	peak (source) power value
	$P_{gauss}(b)$	background power value
	$P_{fcs}(f,h)$	in-band power on the detector from the FCS due to heating power h
	$P_{target}(f')$	in-band power obtained from the source
	$P_{fcs}(f,h)$	in-band power for given FCS heating power h
		constant
		detection limit in multiples of $\sigma$
		quaternion
	$Q_{raster}$	quarternion that defines the position of the PHT central field of view for
		a given raster point in the J2000 inertial frame
	$Q_{str}$	defines the J2000 pointing of the ISO star tracker
	$Q_{r}$	defines the raster point relative to the raster centre of the scan
	$Q_{str/qss}$	describes misalignment between the star tracker and the quadrant star
		sensor (QSS)
	$Q_{qss/pht}$	describes the QSS to instrument aperture alignment
	$Q_{cor}$	gives the fine pointing correction to the star tracker calibration
		quarternions representing the rotations of the detector origin with
		respect to a given raster point, assuming perfect alignment between
		chopper and spacecraft y-axis
	$Q_{chop}$	chopper quaternion
		constant
		responsivity
	$R_{c}$	average relative system response derived from a bandpass
	$R_{det}$	detector responsivity
	$R_{det}$ (i)	detector responsivity of pixel i
	$R_{default}$	default detector responsivity
		responsivity for each pixel of a C detector
	$R_{FCS}(i)$	responsivity of pixel obtained from FCS
$R(\lambda)$		system response at specific wavelength
$R_{s}$		sensor resistance
		constant in resistance
	$R_{k}$	harness resistance
	$R_{p}$	EEU shunt resistor in parallel to sensor
		measured responsivity of pixel relative to default responsivity
		signal in V/s
	$s_{src}$	source signal
		signal at time t
		pairwise differences between V(k) and V(k+1)
		slope for ramp j
	$s(RI, DAT\_RED)$	signal taken with reset interval RI and data reduction rate DAT_RED
	$s'(\phi(t))$	signal after orbital dependent dark correction
	$s(\phi(t))$	initial signal
	$s_{dark}$ ( $\phi$ (t))	orbit dependent dark correction
	$s_{old}$	signal before signal linearisation
	$s_{new}$	signal after signal linearisation
		signal
		average of valid signals per chopper plateau
	$s_{diff}$	difference signals of consecutive readouts
		generic pattern
	$s_{scr}$	source signal determined via generic pattern
	$s^{c}_{scr}$	source signal determined via generic pattern, corrected for losses due to
		chopper modulation
	$s_{k}$ (x)	source signal for chopper cycle k
	$s_{k}$ (X)	given set of powers
	$<s_{fcs}(f)>$	weighted mean signal for FCS measurement
	$<s_{fcs}(i,f)>$	FCS signal per chopper plateau
$s_{pixel}$		image pixel size
		nominal uncertainty of fit
		uncertainty of fit
		signal
	$S_{src}$	linearised difference signal (from chopped measurement)
	$S'_{src}$	linearised difference signal, corrected for losses due to chopper
		modulations
	$S_{on}$ , S $_{off}$	on- and off-source signals
		signal for pixel i at raster point k
	$S^{f}_{cal}$	measured signal of calibrator
	$S^{f}_{str}$	measured dark FCS signal (stray light)
	$S^{f'}_{fcs}$	signal of FCS measurement in filter f'
	$S_{scr}(a)$	linearised source signal (PHT-P) after dark signal subtraction
	$S_{scr}(i)$	linearised source signal (PHT-C) after dark signal subtraction
		signal transient of pixel i at time t
	$S^{det}_{dark}$	orbit dependent dark signals
		size
	$S_{fine grid}$	side length of (square) fine grid image pixel
	$S_{pixel}$	side length of square detector pixel
		time in s
	$t_{mid}$	time at midpoint of a given ramp
	$t_{0}$	time at first readout of a given ramp
	$t_{dwell}$	chopper dwell time
	$t_{m}$	measurement time
	$t_{r}$	reset interval time
	$t_{plat}$	chopper plateau time
	$t_{n}$	dwell time
		temperature in K
		EEU temperature
$T_{refl}$		reflection losses on optical elements
tmd		telemetry data value
	$tmd_{max}$	maximum value of telemetry word (=4096)
	TOL	voltage for chopper deflection calibration
	RA	right ascension
		chopper unit
		uncertainty
	$u_{n}$ (i,j)	mean brightness uncertainty contribution from nth sky sample
		voltage in V
	$U_{ACF_{1}}$	voltage for chopper deflection calibration
	$U_{DCF_{1}}$	voltage for chopper deflection calibration
	$U_{OF_{1}}$	voltage for chopper deflection calibration
	$U_{OF_{2}}$	voltage for chopper deflection calibration
	$U_{CRE}$	CRE output voltage
	$U_{off}$	GAIN $_{1}$ dependent offset voltage
		uncertainty
	$U_{n}$ (i,j)	accumulated mean brightness uncertainty
	$U_{rms}$ (i,j)	brightness uncertainty from rms
		voltage in V
		voltage corresponding to readout k
	$V_{ini}$	voltage
		weight
		weight function for PHT-S chopped measurements
	$w_{j}$	statistical weight of each signal obtained from its associated statistical
		uncertainty
		distance or coordinate
	$x_{m}$	margin around raster in m direction
	$x_{n}$	margin around raster in n direction
	$x_{0}$	angular x coordinate of the image pixel origin
$X^{raw}_{FPC}$		data word for focal plane chopper position
		distance or coordinate
	$y_{det}$	chopper deflection
	$y_{0}$	angular y coordinate of the image pixel origin
		distance or coordinate
	$z_{det}$	spacecraft z-offset