[daip] Trouble loading X-ray FITS file
Eric Greisen
egreisen at nrao.edu
Tue Sep 2 13:02:08 EDT 2003
Chun writes:
> Attach is the PRTTP file. I'm still getting these TAPE mount errors ( I
> did comment all my tapes out of my TPHOSTS.LIST file ):
What tape mount errors? With the below you can only have remote
tapes not real ones. This requires that some machine with a real tape
device also run aips.
> >tape
> AIPS 1: AIPS tapes on URSA
> AIPS 1: Tape Device name Description
> AIPS 1: ----------------------------------------------------------------
> AIPS 1: 1. (remote) REMOTE TAPE
> AIPS 1: 2. (remote) REMOTE TAPE
>
> There are also floating point errors:
> Note: IEEE floating-point exception traps enabled:
> overflow; division by zero; invalid operation;
> Nonstandard floating-point mode enabled
> See the Numerical Computation Guide, ieee_handler(3M), ieee_sun(3M)
These are not errors - it is a list of enabled traps. If one had
gone off then there would be an abort.
>
> I have been able to load Radio FITS file (with the tape and floating point
> problems before)
>
> SIMPLE = T / file does conform to FITS standard
> BITPIX = 16 / number of bits per data pixel
> NAXIS = 0 / number of data axes
> EXTEND = T / FITS dataset may contain extensions
This says that there is no image - so there is nothing that AIPS is
expected to understand.
> XTENSION= 'BINTABLE' / binary table extension
> BITPIX = 8 / 8-bit bytes
> NAXIS = 2 / 2-dimensional binary table
> NAXIS1 = 60 / width of table in bytes
> NAXIS2 = 149272
> PCOUNT = 0 / size of special data area
> GCOUNT = 1 / one data group (required keyword)
> TFIELDS = 18 / number of fields in each row
> EXTNAME = 'EVENTS ' / name of this binary table extension
> HDUNAME = 'EVENTS ' / ASCDM block name
The first table extension on this non-image is an events table -
listing each X-ray event. Images may be constructed from such things
but not by AIPS.
Eric Greisen
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