Near-infrared colour–magnitude diagram of spectrally classified stars, showing the dereddened K_s0 magnitude as a function of (J − K_s)₀ from 2MASS photometry. Uncertainties are comparable to symbol sizes. Red objects are to the right, faint objects at the top. Circles: M-type stars. Filled symbols: carbon stars. The labels correspond to the KG number: KG-2, 21, 62, 67 are in the halo. Objects labelled ‘3 Scl’ and ‘4 Scl’ are in Sculptor. The spectrum of KG-14 (filled triangle) is unclear, but its colour favors a carbon type.