spec2big
spec2big
spec2big converts extracted spectra from extensions format to equispec format.
| USAGE | spec2big framename
| ||
| INPUT | framename_2spec.fits are the set of image files to be combined
| ||
| OUTPUT |
| ||
| PARAMETERS | none |
Details:
spec2big converts extracted spectra from extensions format to equispec format. The spectra and noise are separated into two files. Standard equispec header keywords are used for compatibility in programs such as IRAF.
The header of all the spectra contains the following parameters:
N_SLITS = number of slits extracted D_SLIT = interval along slit, in arc seconds CRVAL1 = wavelength of first pixel CDELT1 = wavelength interval of pixels CRPIX1 = starting pixel EXPTIME = total exposure time of the spectrum SHUFFLED = does data included shuffled region? NOD = nod distance, in pixels (for N&S; data)
Each spectrum has the following header keywords:
OBJxxx = object name, as defined in the SMF file for the mask APNUMxxx = additional aperture information CNTRLxxx = the line in the 2-d spectrum centered on the object CSECTxxxA = lower 2d spectra region in pixels CSECTxxxB = upper 2d spectra region in pixels
Additional standard header keywords:
WAT0_001 WAT1_001 WAT2_001 WAT3_001 WCSDIM DC-FLAG CTYPE1 LTM1_1 CD1_1 CTYPE2 LTM2_2 CD2_2 CTYPE3 LTM3_3 CD3_3