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3. Instrument Modes and Astronomical Observation Templates

The three main PHT observing modes are photometry, spectrophotometry and polarimetry. In the photometric mode PHT offered a number of possibilities to observe point-like and extended sources, in staring or in chopped observing mode.

In the following sections these modes are described in detail. Chopping is regarded here as a general procedure applicable to several modes.


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