Description Parameter: Section 4.5.4 Processing Level: SPD Usage in processing: Section 7.10.4 File Type: Fits Image Units: dimensionless Number of Records: 1 File Names: PC1ILLUM_01, PC1ILLUM_02, PC2ILLUM_01, PC2ILLUM_02,
The FCS illumination is not uniform. For the PHT-C arrays, the non-uniform illumination requires a pixel dependent correction to the FCS power calibration table which gives only the mean value over the pixel array. Note that the illumination correction products contain only 1 record.
The properties (FCS1,TRS2) altered between rev 93 and 94 due to unknown reasons. This event changed the FCS illumination pattern. Therefore two calibration files are available: one for before rev 94 (suffix _01) and one for rev 94 and higher (suffix _02).
All products have:
NAXIS = 4
TYPE = R*4
AXIS Length Description 1 9 C100 Pixels, in same order as SPD 2 7(see Section A.1) 3 2 each FCS 4 2 Correction and uncertainty
AXIS Length Description 1 4 C200 Pixels, in same order as SPD 2 5(see Section A.1) 3 2 each FCS 4 2 Correction and uncertainty