16.5 Converting XAS files to/from OGIP FITS files

Some kind of data files (although formally FITS) have very peculiar formats according to the OGIP conventions used by some X-ray astronomy packages. Dedicated programs exist to handle these peculiarities (however only mandatory items are handled; any optional keyword must be added/edited care of the user using target package's facilities).

Note that response matrices can be accumulated directly in OGIP form, without need of conversion.

There are two commands to handle XAS <--> OGIP conversion :

conversion from XAS to OGIP
```
toogip [file {extraargs}
```
converts a XAS file (the filetype part of the name may be omitted if it can be derived from the context) into a FITS OGIP file. The name of the output file is obtained replacing the filetype dot with an underscore and adding a .fits extension.
extraargs may be asked if the conversion process requires naming additional files.
It is care of the user to rename the file if so is required by the target package.
The XAS file types handled so far are response matrices (.matrix) and spectra (.spectrum).
conversion from OGIP to XAS
```
fromogip [fitsfile {extraargs}
```
converts a FITS OGIP file into a XAS file. The file types handled so far are response matrices and spectra.
In the case of matrices if the FITS file is a "raw" RMF, extraargs have to be used to supply the name of an associated ARF. The resulting XAS matrix will be the product of the two. If extraargs is none just the RMF will be converted to XAS format.

Beware that the conversion from/to FITS is handled using the FITSIO library, and therefore it uses that library's error conventions (in particular an existing FITS file is never overwritten, contrary to XAS usage) and codes.

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sax.iasf-milano.inaf.it/Xashelp/export.5.html :: original creation 2002 Sep 04 18:09:55 CEST :: last edit 2002 Sep 04 18:09:55 CEST

16.5 Converting XAS files to/from OGIP FITS files

conversion from XAS to OGIP

conversion from OGIP to XAS

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