On Saturday, July 27, from 11:00 to 21:00 UTC (7 am to 5 pm US Eastern Time), all MAST services will be unavailable due to maintenance.
Reading Data
The XMM mosaic images are simple primary array FITS files
and should be readable with most FITS readers. The source files
are stored as a single extension binary table FITS file
containing 83 scalar fields.
The raw files from HEASARC are also FITS files and should be easily read.