Calibration data from Arne:
NGC7790 Standard Field Update 14 October 1999 field center approximately star 20 at 23:58:23.20 +61:12:25.0 J2000 4 Observations ID RA (J2000) DEC V B-V U-B V-R R-I verr bverr uberr vrerr rierr 1 359.566634 61.280182 11.659 0.567 0.130 0.349 0.346 0.005 0.006 0.044 0.002 0.014 2 359.681309 61.247799 13.518 0.458 -0.047 0.316 0.366 0.005 0.012 0.014 0.006 0.003 3 359.674397 61.246143 13.135 0.537 0.271 0.323 0.354 0.006 0.007 0.019 0.008 0.013 4 359.519403 61.271313 13.469 0.428 0.209 0.255 0.280 0.006 0.003 0.051 0.006 0.007 5 359.532755 61.245362 13.686 0.390 -0.231 0.259 0.291 0.006 0.013 0.037 0.013 0.027 6 359.594323 61.236925 13.626 0.751 0.126 0.454 0.478 0.011 0.002 0.021 0.004 0.018 7 359.533764 61.210837 12.896 2.064 2.303 1.329 1.543 0.022 0.024 0.058 0.007 0.049 8 359.530909 61.195801 11.048 0.253 -0.567 0.183 0.203 0.022 0.007 0.041 0.005 0.005 9 359.537869 61.190471 13.242 0.509 0.310 0.312 0.345 0.013 0.007 0.015 0.013 0.001 10 359.554895 61.190279 13.108 1.224 0.779 0.709 0.699 0.011 0.009 0.026 0.004 0.020 11 359.572731 61.193578 12.125 0.409 -0.103 0.280 0.325 0.010 0.005 0.009 0.005 0.006 12 359.557342 61.176649 12.624 0.439 0.206 0.271 0.305 0.013 0.006 0.018 0.008 0.004 13 359.645726 61.205306 13.317 0.388 -0.136 0.255 0.296 0.000 0.007 0.008 0.013 0.014 14 359.645465 61.200245 13.493 0.403 -0.086 0.263 0.305 0.006 0.010 0.014 0.007 0.015 15 359.628441 61.131751 13.448 1.485 1.211 0.836 0.809 0.011 0.015 0.028 0.003 0.017 16 359.756764 61.133029 11.720 1.406 1.193 0.772 0.739 0.013 0.014 0.039 0.001 0.006 17 359.723655 61.183857 13.201 1.493 1.334 0.835 0.797 0.010 0.007 0.045 0.013 0.020 18 359.703152 61.209622 13.183 0.490 0.293 0.290 0.344 0.005 0.006 0.017 0.004 0.005 19 359.626446 61.227935 13.262 0.688 0.115 0.433 0.445 0.014 0.011 0.018 0.007 0.010 20 359.596678 61.206957 12.783 0.388 -0.125 0.265 0.310 0.006 0.010 0.008 0.002 0.001 21 359.740037 61.162632 13.342 1.484 1.405 0.811 0.760 0.014 0.014 0.049 0.004 0.010 22 359.709493 61.167122 13.724 1.381 1.092 0.784 0.757 0.014 0.013 0.022 0.010 0.004 23 359.657828 61.260930 13.454 1.521 1.382 0.869 0.820 0.011 0.008 0.034 0.006 0.012 24 359.714110 61.287535 12.953 1.292 0.971 0.752 0.716 0.009 0.007 0.053 0.006 0.023 25 359.793534 61.270575 13.677 1.367 1.289 0.864 0.792 0.008 0.004 0.064 0.004 0.008 26 359.571192 61.161605 14.499 1.205 0.731 0.696 0.664 0.012 0.013 0.032 0.009 0.010 27 359.512978 61.137231 12.462 0.691 0.108 0.428 0.440 0.013 0.009 0.045 0.006 0.011 28 359.473495 61.170573 12.784 1.353 1.105 0.748 0.699 0.017 0.013 0.039 0.007 0.021 29 359.508551 61.191277 12.499 0.531 0.163 0.324 0.338 0.013 0.009 0.035 0.005 0.011 30 359.808449 61.154727 12.812 0.791 0.292 0.486 0.527 0.009 0.010 0.047 0.007 0.011 31 359.812589 61.166475 12.592 1.733 1.904 0.945 0.894 0.013 0.016 0.053 0.007 0.006