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12.1 Overview  

This chapter contains detailed descriptions of all ISOPHOT OLP products except for the Cal G files (see chapter 13). The contents and structure of the FITS headers and records are presented. References to additional information given in this manual are provided. It must be noted that
in case of any discrepancies with the IDPD [25], the IDPD takes precedence.

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 one 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. For more about the FITS standard see the ISO Satellite and Data Manual [17].
• ISO (spacecraft) related information. This includes descriptions of ISO related fields - see also the ISO Satellite and Data Manual for complete lists.
• General ISOPHOT header information which is used for several PHT products.
• Product specific header fields.

Table 12.1 gives a summary of ISO common fields in headers. More information is available in the ISO Satellite Data Manual [17].

For the binary FITS records, the following abbreviations are used in the tables given in this chapter:

Off		 offset in bytes of field in record 
N		 number of values 
T		 type of field (I=integer, R=real, C=character, L=logical)