Table 2: Coordinates, IR, and optical magnitudes for the reference stars.
  A B C
RA 21:58:46.505 21:58:43.807 21:58:42.337
Dec -30:17:51.29 -30:17:15.71 -30:10:27.41
K 11.171 $\pm $ 0.024 12.475 $\pm $ 0.030 12.648 $\pm $ 0.024
H 11.182 $\pm $ 0.027 12.556 $\pm $ 0.026 12.769 $\pm $ 0.027
J 11.510 $\pm $ 0.027 12.838 $\pm $ 0.026 13.091 $\pm $ 0.029
I 12.184 $\pm $ 0.005 13.421 $\pm $ 0.009 13.216 $\pm $ 0.006
R 12.981 $\pm $ 0.004 13.434 $\pm $ 0.006 13.671 $\pm $ 0.010
V 13.179 $\pm $ 0.005 13.822 $\pm $ 0.009 13.899 $\pm $ 0.013

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