The following calibration format can be used directly in IRAF.digiphot.photcal.invertfit. The instrumental magnitudes mJ, mH, and mK are -2.5*log(counts/s)+25. For the these images, the average parameters for JHK are the following: Airmass---1.25, 1.31, 1.49 Integration time (s)---30.96, 11.0, 5.93 Pixel scale (arcsec)---1.5, 1.5, 1.5 # Fri 12:24:33 07-Nov-2003 begin JFIT status 0 (Solution converged) variance 0.001238406 stdeviation 0.035191 avsqerror 0.001236442 averror 0.03516307 avsqscatter 0.001033847 avscatter 0.03215349 chisqr 1.001589 msq 0.001122306 rms 0.03350083 reference mJ fitting J+j1+j2*XJ+j3*JH weights photometric parameters 3 j1 (fit) j2 (fit) j3 (fit) derivatives 3 0.1 0.1 0.1 values 3 3.505656 0.02328703 -0.0552319 errors 3 0.06636151 0.0452607 0.04569536 # Fri 12:32:05 07-Nov-2003 begin HFIT status 0 (Solution converged) variance 9.441753E-4 stdeviation 0.03072743 avsqerror 9.418633E-4 averror 0.03068979 avsqscatter 5.565012E-4 avscatter 0.02359028 chisqr 1.002455 msq 8.352320E-4 rms 0.02890038 reference mH fitting (J-JH)+h1+h2*XH+h3*JH weights photometric parameters 3 h1 (fit) h2 (fit) h3 (fit) derivatives 3 0.1 0.1 0.1 values 3 3.660852 0.04358641 0.0450604 errors 3 0.08355504 0.05664495 0.05458168 # Fri 12:36:18 07-Nov-2003 begin KFIT status 0 (Solution converged) variance 0.001029742 stdeviation 0.03208959 avsqerror 0.001392134 averror 0.03731131 avsqscatter 3.608931E-4 avscatter 0.01899719 chisqr 0.7396859 msq 9.414782E-4 rms 0.03068352 reference mK fitting (J-JH-HK)+k1+k2*XK+k3*HK weights photometric parameters 3 k1 (fit) k2 (fit) k3 (fit) derivatives 3 0.1 0.1 0.1 values 3 4.332621 0.05576435 -0.118393 errors 3 0.04541185 0.03290121 0.2133238