14.1 Listing file headers


A XAS file has a header composed by a list of keywords, which are normally used programmatically.
It is also possible to list the entire header at the terminal using the command
hlist [ file
which produces a listing of the form given below. It is also possible to use standard operating system facilities to redirect the output to a file, or to restrict the output to a limited subset of keywords (e.g. for Unix users hlist file > outfile or hlist file | grep keyword.
This is an example of the output. The type of each keyword is indicated (before its name and value) using codes
 File prova.spectrum                           of type SPE
 Record length                                 16 bytes
 Mini-header records                            2
 Data        records                          256
 Full header records                           73
------------------------------------------------------------------------

 (J) BITPIX       =            8
 (J) NAXIS1       =           16
 (J) NAXIS2       =          256
 (J) TFIELDS      =            4
 (C) FILENAME     = prova_spectrum
 (C) OBSERVER     = SAX TEAM (OP_884
 (C) OBJECT       = Crab
omissis...
 (C) PACKET       = m1dir002
 (J) NPACKET      =         3235
 (D) EXPOSURE     =  4554.62890625
 (C) HISTORY      = saxhaccum prova m1dir002 PHA 0 255 1 1996 9 6 19 51 9 1996 9 6 21
 (C) HISTORY      = + 17 20 27 60 0 255 0 255
 ------------------------------------------------------------------------
 For a total of     48 keywords

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