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Table 2

Colors of the targets, reference stars, and comparison stars for every observed field.

Field Star ID g gr

J0759+5050 16.09 0.31
star1 15.58 0.44
star2 13.65 1.18
J1430+1339 15.80 0.37
star1 16.68 1.1
star2 15.01 1.21
Mrk477 14.84 0.14
star1 15.01 0.60
star2 13.23 1.05

Notes. The values are adopted from the SDSS data release 12.

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