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Intrinsic sequences of luminosity V and III stars in the J-H vs. H-Ks diagramof the 2MASS system are determined using about 1250 unreddened and dereddenedstars. Intrinsic color indices for MK spectral classes are tabulated andcompared with the results in other JHK systems.

Intrinsic color indices and luminosity sequences of stars in the 2MASS two-color diagram