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---1.31, -, -
Integration time (s)---20.94, -, -
Pixel scale (arcsec)---1.5, -, -

# Mon 14:17:50 08-Dec-2003
begin	JFIT
	status	0	(Solution converged)
	variance	0.001697266
	stdeviation	0.04119789
	avsqerror	0.001695789
	averror		0.04117996
	avsqscatter	0.001568589
	avscatter	0.03960542
	chisqr		1.000871
	msq		0.001659826
	rms		0.04074097
	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
		3.646773
		0.1306086
		-0.0646304
	errors	3
		0.03377928
		0.01393597
		0.08890826

# Fri 14:02:15 23-Apr-2004
begin	HFIT
	status	0	(Solution converged)
	variance	0.00125973
	stdeviation	0.03549268
	avsqerror	0.001257986
	averror		0.03546811
	avsqscatter	9.759521E-4
	avscatter	0.03124023
	chisqr		1.001386
	msq		0.001234536
	rms		0.03513596
	reference	mH
	fitting		(J-JH)+h1+h2*XH+h3*JH
	weights		photometric
	parameters	3
		h1	(constant)
		h2	(constant)
		h3	(fit)
	derivatives	3
		0.1
		0.1
		0.1
	values	3
		3.8
		0.074
		0.1409398
	errors	3
		0.
		0.
		0.01548071

# Fri 14:41:47 23-Apr-2004
begin	KFIT
	status	0	(Solution converged)
	variance	7.307985E-4
	stdeviation	0.02703328
	avsqerror	7.295386E-4
	averror		0.02700997
	avsqscatter	1.387886E-4
	avscatter	0.01178086
	chisqr		1.001727
	msq		7.127540E-4
	rms		0.02669745
	reference	mK
	fitting		(J-JH-HK)+k1+k2*XK+k3*HK
	weights		photometric
	parameters	3
		k1	(fit)
		k2	(fit)
		k3	(constant)
	derivatives	3
		0.1
		0.1
		0.1
	values	3
		0.0
		0.0
		0.0
	errors	3
		0.0
		0.0
		0.0