Data Files Handbook
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With few exceptions, all PPS products are supplied in compressed form,
that is, each product is individually compressed using the Unix
command gzip. The exceptions are:
Note that fits file viewers like fv or ds9, as well as the SAS tasks can
work on compressed FITS files, and it is therefore not necessary to
uncompress. However, for very large files, the SAS tasks run significantly
faster if the files are uncompressed beforehand.
- PNG product files. PNG is already an intrinsically compressed format.
- PDF product files. These are created intrinsically compressed.
- PPS run message product files, that are (small) ASCII files.
- HTML files. Browsers do not understand gzipped HTML files.
European Space Agency - XMM-Newton Science Operations Centre