Descriptor Items
The list presented here contains the most commonly used FITS-type
descriptor items in GIPSY.
Name Type Meaning
--------- --------- ------------------------------------------
BUNIT CHAR data units (WU,MJY/SR,...)
POL CHAR polarization (I,Q,U,V,XX,...)
OBSTYP CHAR type of observation (LINE,CONT)
FSCRA DBLE RA fringe stopping center (degrees)
FSCDEC DBLE DEC fringe stopping center (degrees)
BANDW DBLE total bandwidth of observation
EPOCH DBLE epoche of observation (years)
NINTF INT number of interferometers used
NPOL INT number of polarizations used (1,2,4)
NFREQ INT number of frequency points used
REDCODE CHAR LINEMAP reduction code
MAPCODE CHAR LINEMAP map code
UVGRID CHAR convolving function code
BLGRAD CHAR baseline grading function
NBLANK INT number of undefined values in map
INSTRUME CHAR source of data (WSRT,TAURUS,...)
MAPVSN CHAR tape volume of map archive
MAPLAB CHAR tape label of map archive
APVSN CHAR tape volume of Antenna Pattern
APLAB CHAR tape label of Antenna Pattern
PCRA DBLE pointing center RA (degrees)
PCDEC DBLE pointing center DEC (degrees)
MAXBASE DBLE maximum baseline (meter)
MINBASE DBLE minimum baseline (meter)
BMMIN DBLE minor axis (FWHM) of beam (arcsec)
BMMAJ DBLE major axis (FWHM) of beam (arcsec)
RESOL DBLE resolution of spectral axis
EQUINOX DBLE equinox of coordinate system (years) ?
DATE-OBS CHAR observation date (DD/MM/YY)
APSET INT set number of antenna pattern ?
APSSET INT subset number of antenna pattern ?
FILEID CHAR identification of file
FREQ0 DBLE Rest frequency of spectral line (Hz)
UVFREQ DBLE reference freq. for UV coords. (MHz)
UVBANDW DBLE bandwidth of UV coordinates (MHz)
NOISE DBLE noise of map
NORM DBLE normalizing factor in FFT
DATAMAX REAL maximum value of map
DATAMIN REAL minimum value of map
OBSERVER CHAR observer name
OBJECT CHAR object name
TAPER CHAR type of frequency taper (HANNING,...)
GRIDTYPE CHAR type of grid
ORIGIN CHAR tape writing institute
DATE CHAR tape writing date (DD/MM/YY)
OBSTIME CHAR observation time (HH:MM:SS)
BMPA DBLE pos. angle of major axis of beam (N->E)