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Table 2
Coefficients and range of applicability of the 
vs. G−Ks relation (top table) and the vs. G−Ks relation (bottom table), Y = a0 + a1X + a2X2 + a3 [Fe/H] + a4 [Fe/H] 2 + a5X [Fe/H].
| T eff | G−Ks range | [Fe/H] range | a 0 | a 1 | a 2 | a 3 | a 4 | a 5 | RMS[Teff(K)] | %outliers | N |
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[1.6, 3.7] | [−2.2, 0.4] | 1.648 ± 0.027 | −0.455 ± 0.023 | 0.054 ± 0.005 | 0.088 ± 0.012 | 0.001 ± 0.002 | −0.026 ± 0.006 | 59 | 1.3 | 523 |
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| Colour | Teff range (K) | [Fe/H] range | a 0 | a 1 | a 2 | a 3 | a 4 | a 5 | RMS[G−Ks] | %outliers | N |
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| G−Ks | [3603.7, 5207.7] | [−2.2, 0.4] | 13.554 ± 0.478 | −20.429 ± 1.020 | 8.719 ± 0.545 | 0.143 ± 0.013 | −0.0002 ± 0.009 | − | 0.05 | 1.3 | 523 |
Notes. We point out that 
. The range of temperatures of the [, G−Ks] calibration (second table) is given in Teff (not ).
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