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Coverage as function of magnitude
These figures are generated from the a version of the GSC2 catalog which included at the time GAIA-DR1, 2MASS, and SDSS.
All Sources
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NIR 12-18 mag Sources
NIR mag refers to the first magnitude present in the list J, H, Y, Z, z, Npg, i, Ks, K (lower case z, i from SDSS; Npg is photographic). This is roughly in order of proximity to J.
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NIR <19 mag Sources
As above, in terms of defining what is NIR.
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OPT <17.2 mag Sources
OPT mag refers to the first magnitude present in the list G, r, V, g, R, Fpg, Epg, Jpg (lower case r, g from SDSS; Fpg, Epg, Jpg are photographic bands)
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