The following calibration format can be used directly in 
IRAF.digiphot.photcal.invertfit. The instrumental magnitudes
mU, mB, and mV are -2.5*log(counts/s)+25.

For the these images, the average parameters for UBV are the following:
Airmass---1.11, 1.05,1.28
Integration time (s)---1800, 1800, 900
Pixel scale (arcsec)---1.134, 1.134, 1.134

# Fri 10:30:18 08-Nov-2002
begin	BFIT
	status	0	(Solution converged)
	variance	4.407164E-4
	stdeviation	0.02099325
	avsqerror	4.396584E-4
	averror		0.02096803
	avsqscatter	2.765275E-4
	avscatter	0.01662911
	chisqr		1.002406
	msq		4.261873E-4
	rms		0.0206443
	reference	mB
	fitting		(BV+V)+b1+b2*XB+b3*BV+b4*BV*XB
	weights		photometric
	parameters	4
		b1	(fit)
		b2	(fit)
		b3	(fit)
		b4	(constant)
	derivatives	4
		0.1
		0.1
		0.1
		0.1
	values	4
		3.693181
		0.2014288
		-0.01482657
		0.
	errors	4
		0.01122489
		0.007020601
		0.004072703
		0.

# Fri 10:31:29 08-Nov-2002
begin	VFIT
	status	0	(Solution converged)
	variance	2.900349E-4
	stdeviation	0.01703041
	avsqerror	2.892801E-4
	averror		0.01700824
	avsqscatter	1.414539E-4
	avscatter	0.01189344
	chisqr		1.002609
	msq		2.807784E-4
	rms		0.01675645
	reference	mV
	fitting		V+v1+v2*XV+v3*BV+v4*BV*XV
	weights		photometric
	parameters	4
		v1	(fit)
		v2	(fit)
		v3	(fit)
		v4	(constant)
	derivatives	4
		0.1
		0.1
		0.1
		0.1
	values	4
		3.261257
		0.1071445
		-0.01082438
		0.
	errors	4
		0.00829612
		0.005253313
		0.002900119
		0.

# Fri 11:00:11 08-Nov-2002
begin	UFIT
	status	0	(Solution converged)
	variance	0.002731319
	stdeviation	0.05226202
	avsqerror	0.00272939
	averror		0.05224356
	avsqscatter	0.00197325
	avscatter	0.04442127
	chisqr		1.000707
	msq		0.00267129
	rms		0.05168452
	reference	mU
	fitting		(UB+BV+V)+u1+u2*XU+u3*UB+u4*UB*XU
	weights		photometric
	parameters	4
		u1	(fit)
		u2	(fit)
		u3	(constant)
		u4	(constant)
	derivatives	4
		0.1
		0.1
		0.1
		0.1
	values	4
		5.323316
		0.4120857
		-0.0766
		0.
	errors	4
		0.02801527
		0.01795449
		0.
		0.

# Fri 11:01:19 08-Nov-2002
begin	BFIT
	status	0	(Solution converged)
	variance	5.843402E-4
	stdeviation	0.02417313
	avsqerror	5.823294E-4
	averror		0.0241315
	avsqscatter	3.328577E-4
	avscatter	0.01824439
	chisqr		1.003453
	msq		5.719074E-4
	rms		0.02391459
	reference	mB
	fitting		(BV+V)+b1+b2*XB+b3*BV+b4*BV*XB
	weights		photometric
	parameters	4
		b1	(fit)
		b2	(fit)
		b3	(constant)
		b4	(constant)
	derivatives	4
		0.1
		0.1
		0.1
		0.1
	values	4
		3.690263
		0.2034149
		-0.0148
		0.
	errors	4
		0.01174467
		0.007465799
		0.
		0.

# Fri 11:02:26 08-Nov-2002
begin	VFIT
	status	0	(Solution converged)
	variance	2.545288E-4
	stdeviation	0.01595396
	avsqerror	2.524898E-4
	averror		0.01588993
	avsqscatter	1.373792E-4
	avscatter	0.01172089
	chisqr		1.008075
	msq		2.490551E-4
	rms		0.01578148
	reference	mV
	fitting		V+v1+v2*XV+v3*BV+v4*BV*XV
	weights		photometric
	parameters	4
		v1	(fit)
		v2	(fit)
		v3	(constant)
		v4	(constant)
	derivatives	4
		0.1
		0.1
		0.1
		0.1
	values	4
		3.261801
		0.1069098
		-0.0111
		0.
	errors	4
		0.008078038
		0.005174692
		0.
		0.

# Fri 11:16:10 08-Nov-2002
begin	UFIT
	status	0	(Solution converged)
	variance	0.003017146
	stdeviation	0.05492855
	avsqerror	0.003015286
	averror		0.05491162
	avsqscatter	0.002167479
	avscatter	0.04655619
	chisqr		1.000617
	msq		0.002985386
	rms		0.05463869
	reference	mU
	fitting		(UB+BV+V)+u1+u2*XU+u3*UB+u4*UB*XU
	weights		photometric
	parameters	4
		u1	(constant)
		u2	(fit)
		u3	(constant)
		u4	(constant)
	derivatives	4
		0.1
		0.1
		0.1
		0.1
	values	4
		5.3049
		0.4227754
		-0.0766
		0.
	errors	4
		0.
		0.003386221
		0.
		0.

# Fri 11:17:14 08-Nov-2002
begin	BFIT
	status	0	(Solution converged)
	variance	5.179017E-4
	stdeviation	0.02275745
	avsqerror	5.225522E-4
	averror		0.0228594
	avsqscatter	3.167792E-4
	avscatter	0.01779829
	chisqr		0.9911004
	msq		5.122723E-4
	rms		0.02263343
	reference	mB
	fitting		(BV+V)+b1+b2*XB+b3*BV+b4*BV*XB
	weights		photometric
	parameters	4
		b1	(constant)
		b2	(fit)
		b3	(constant)
		b4	(constant)
	derivatives	4
		0.1
		0.1
		0.1
		0.1
	values	4
		3.678
		0.2112887
		-0.0148
		0.
	errors	4
		0.
		0.00135361
		0.
		0.

# Fri 11:18:21 08-Nov-2002
begin	VFIT
	status	0	(Solution converged)
	variance	2.812528E-4
	stdeviation	0.01677059
	avsqerror	2.803515E-4
	averror		0.0167437
	avsqscatter	1.387285E-4
	avscatter	0.01177831
	chisqr		1.003215
	msq		2.782607E-4
	rms		0.01668115
	reference	mV
	fitting		V+v1+v2*XV+v3*BV+v4*BV*XV
	weights		photometric
	parameters	4
		v1	(constant)
		v2	(fit)
		v3	(constant)
		v4	(constant)
	derivatives	4
		0.1
		0.1
		0.1
		0.1
	values	4
		3.254
		0.111847
		-0.0111
		0.
	errors	4
		0.
		9.457187E-4
		0.
		0.

# Fri 10:19:50 08-Nov-2002
begin	UFIT
	status	0	(Solution converged)
	variance	0.004688184
	stdeviation	0.06847031
	avsqerror	0.004686876
	averror		0.06846076
	avsqscatter	0.003162229
	avscatter	0.0562337
	chisqr		1.000279
	msq		0.004512377
	rms		0.06717423
	reference	mU
	fitting		(UB+BV+V)+u1+u2*XU+u3*UB+u4*UB*XU
	weights		photometric
	parameters	4
		u1	(fit)
		u2	(fit)
		u3	(fit)
		u4	(constant)
	derivatives	4
		0.1
		0.1
		0.1
		0.1
	values	4
		5.168071
		0.5094084
		-0.09145314
		0.
	errors	4
		0.04789072
		0.03419954
		0.01367779
		0.