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---1.05, 1.15, -
Integration time (s)---30.93, 8.93, -
Pixel scale (arcsec)---1.5, 1.5, -

# Fri 12:39:09 23-Apr-2004
begin	JFIT
	status	0	(Solution converged)
	variance	0.001019377
	stdeviation	0.03192768
	avsqerror	0.001017745
	averror		0.03190212
	avsqscatter	8.777083E-4
	avscatter	0.02962614
	chisqr		1.001603
	msq		9.996467E-4
	rms		0.03161719
	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
		3.63639
		0.1470083
		-0.004540632
	errors	3
		0.020433
		0.01033582
		0.05138629

# Fri 12:41:26 23-Apr-2004
begin	HFIT
	status	0	(Solution converged)
	variance	9.946651E-4
	stdeviation	0.03153831
	avsqerror	9.933973E-4
	averror		0.03151821
	avsqscatter	7.469424E-4
	avscatter	0.02733025
	chisqr		1.001276
	msq		9.743657E-4
	rms		0.03121483
	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
		3.850018
		0.06875478
		0.0473049
	errors	3
		0.01982311
		0.01155774
		0.04190972

# 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
		4.418268
		0.112049
		-0.16
	errors	3
		0.01968891
		0.01546073
		0.