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---1.16, 1.16, 1.43 Integration time (s)---25.92, 5.92, 2.90 Pixel scale (arcsec)---1.5, 1.5, 1.5 # Fri 12:42:23 07-Nov-2003 begin JFIT status 0 (Solution converged) variance 5.110763E-5 stdeviation 0.00714896 avsqerror 0.005418425 averror 0.07360995 avsqscatter 0. avscatter 0. chisqr 0.009432192 msq 2.044305E-5 rms 0.004521399 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 3.898929 0.1311164 -0.06764617 errors 3 0.1218748 0.08414957 0.07885012 # Fri 12:43:48 07-Nov-2003 begin HFIT status 0 (Solution converged) variance 9.508418E-4 stdeviation 0.03083572 avsqerror 9.594037E-4 averror 0.03097424 avsqscatter 0. avscatter 0. chisqr 0.9910758 msq 3.803367E-4 rms 0.01950222 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 3.755863 0.1099514 0.08822397 errors 3 0.1667062 0.1102473 0.09596683 # Fri 12:45:08 07-Nov-2003 begin KFIT status 0 (Solution converged) variance 0.002424578 stdeviation 0.04924 avsqerror 0.002432484 averror 0.04932022 avsqscatter 5.174546E-5 avscatter 0.007193432 chisqr 0.9967498 msq 9.698311E-4 rms 0.03114211 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 4.43712 0.0988901 -0.1696713 errors 3 0.2133531 0.1442799 0.4246863