XMM-Newton Data Files Handbook

4.1.7 OM science files

The following OM Science Files are defined:

1. Imaging Mode Data Image Files (*OM*IMI.FIT)

2. Imaging Mode (full frame high resolution) Data Image Files (*OM*E4I.FIT)

3. Fast Mode Event List Files (*OM*FAE.FIT)

4. Tracking History Data Auxiliary File (*OM*THX.FIT)

5. Reference Frame Data Auxiliary File (*OM*RFX.FIT)

6. Priority Field Acquisition Auxiliary Files (*OM*PFX.FIT)

7. Priority Window Data Auxiliary Files (*OM*WDX.FIT)

8. Priority Fast Auxiliary File (*OM*PAX.FIT)

9. Periodic Housekeeping file (*OM*PEH.FIT)

10. Non-periodic Housekeeping file (*OM*NPH.FIT)

These files are all binary table files, except the imaging data, which are written in a single IMAGE extension. Type 9 are engineering type data, which are not available for general users. The reader may refer to [6] for a detailed description of its structure and content.

The first two modes above map one-to-one the corresponding instrumental modes, as specified in [16]: the Imaging and the Fast mode, respectively.

The above files can be recognised by the value of the keyword DATATYPE in their binary/image table header, as indicated in Table 16.

Table 16: Values of the DATATYPE keywords for the OM science data file types

Data mode	value of DATATYPE
Imaging Mode	IMG.EL
Full-frame low resolution	IMG.EM
Full-frame high resolution	ENG.IM
Fast Mode	FST.EL
Reference frame Auxiliary file	REF.EL
Tracking history Auxiliary File	TRH.EL