The contents and structure of the FITS headers and records are presented. References to additional information given in this manual are provided. The PHT instrument incorporates several subsystems including single detector photometers, detector arrays and a low-resolution grating spectrometer. Those can be operated with several filters, polarizers and apertures in single pointing and raster pointing mode, the latter with different sampling steps by the chopper. This means that a wide variety of products are produced for the various detectors and operating modes.
All products have header information which can be divided into the following categories.
General FITS information which is part of the FITS standard. Product specific header fields. Table 13.1 gives a summary of ISO common fields in headers.