XMM-Newton Data Files Handbook

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3.2 Portable Data Format (PDF)

Intrinsically compressed PDF files are used for the display of line graphics. In some cases, these graphics files are derived, at least in part, from product files in FITS format. In these cases the PDF file is significantly smaller than the FITS file and/or contains annotations providing a user-friendly summary of the FITS file.

European Space Agency - XMM-Newton Science Operations Centre