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I have a problem concerning dohydra. I use the following version of IRAF: NOAO PC-IRAF Revision 2.12.1-EXPORT and after I CCDPROC'ed all the files and want to use dohydra, I get the following error message :
ERROR on line 69: Aperture reference spectrum not found - Flat2.fits
dohydra (mode=h)However, every file is in the same folder, so why can't it find Flat2.fits ? Here a short version of the parameter file : objects = "H68.fits" List of object spectra
(apref = "Flat2.fits") Aperture reference spectrum
(flat = "Flat2.fits") Flat field spectrum
(throughput = "") Throughput file or image (optional)
(arcs1 = "arc_h68.fits") List of arc spectra
(arcs2 = "") List of shift arc spectra
(arcreplace = "") Special aperture replacements
(arctable = "") Arc assignment table (optional)\n
(readnoise = "RDNOISE") Read out noise sigma (photons)
(gain = "GAIN") Photon gain (photons/data number)
(datamax = INDEF) Max data value / cosmic ray threshold
(fibers = 97) Number of fibers
(width = 12.) Width of profiles (pixels)
(minsep = 8.) Minimum separation between fibers (pixels)
(maxsep = 15.) Maximum separation between fibers (pixels)
(apidtable = "Flat2.fits") Aperture identifications
(crval = "INDEF") Approximate central wavelength
(cdelt = "INDEF") Approximate dispersion
(objaps = "image") Object apertures
(skyaps = "image") Sky apertures
(arcaps = "image") Arc apertures
(objbeams = "0,1") Object beam numbers
(skybeams = "0") Sky beam numbersThank you for your help !cheers,Marc

Check out the following. I suspect is that you have to set imtype=fits.https://iraf.net/phpBB2/viewtopic.php?t=84029&highlight=imtype