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Table 1
Coefficients and range of applicability of colour versus G−Ks relations, Y = a0 + a1(G−Ks) + a2(G−Ks)2 + a3 [Fe/H] + a4 [Fe/H] 2 + a5(G−Ks) [Fe/H].
| Colour | G−Ks range | [Fe/H] range | a 0 | a 1 | a 2 | a 3 | a 4 | a 5 | RMS | %outliers | N |
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| B−G | [1.6, 2.4] | [−1.4, 0.4] | 0.583 ± 0.180 | −0.046 ± 0.187 | 0.215 ± 0.049 | 0.144 ± 0.006 | − | − | 0.02 | 17.9 | 230 |
| B−V | [1.6, 2.4] | [−1.4, 0.4] | −0.094 ± 0.017 | 0.552 ± 0.009 | − | 0.129 ± 0.005 | − | − | 0.02 | 10.4 | 251 |
| B−J | [1.6, 2.4] | [−1.5, 0.4] | −0.117 ± 0.041 | 1.432 ± 0.021 | − | 0.153 ± 0.011 | − | − | 0.03 | 12.9 | 176 |
| B−Ks | [1.6, 2.4] | [−1.5, 0.4] | −0.161 ± 0.038 | 1.757 ± 0.020 | − | 0.141 ± 0.011 | - | − | 0.02 | 9.3 | 254 |
| G−Hp | [1.6, 2.4] | [−1.5, 0.4] | 0.029 ± 0.009 | −0.270 ± 0.005 | − | −0.023 ± 0.003 | − | − | 0.01 | 5.3 | 270 |
| G−V | [1.6, 2.4] | [−1.5, 0.4] | −0.286 ± 0.104 | 0.191 ± 0.107 | −0.110 ± 0.028 | −0.017 ± 0.003 | − | − | 0.01 | 3.9 | 274 |
| G−BT | [1.6, 2.4] | [−1.4, 0.4] | −0.375 ± 0.257 | −0.194 ± 0.267 | −0.218 ± 0.069 | −0.201 ± 0.009 | − | − | 0.03 | 12.7 | 241 |
| G−VT | [1.6, 2.4] | [−1.5, 0.4] | −0.261 ± 0.115 | 0.122 ± 0.119 | −0.109 ± 0.031 | −0.034 ± 0.006 | −0.016 ± 0.007 | − | 0.01 | 3.5 | 272 |
| G−J | [1.6, 3.6] | [−4.8, 1.0] | 0.256 ± 0.021 | 0.510 ± 0.019 | 0.027 ± 0.004 | 0.016 ± 0.002 | 0.005 ± 0.001 | − | 0.02 | 0.2 | 2178 |
| V−J | [1.6, 2.4] | [−1.5, 0.4] | −0.028 ± 0.026 | 0.880 ± 0.013 | − | − | − | − | 0.03 | 2.4 | 200 |
| V−Ks | [1.6, 2.4] | [−1.5, 0.4] | 0.326 ± 0.231 | 0.786 ± 0.237 | 0.112 ± 0.061 | 0.019 ± 0.008 | − | − | 0.01 | 2.1 | 279 |
| J−Ks | [1.6, 3.6] | [−4.8, 1.0] | −0.227 ± 0.024 | 0.466 ± 0.021 | −0.023 ± 0.005 | −0.016 ± 0.002 | −0.005 ± 0.001 | − | 0.02 | 0.1 | 2180 |
| BT−VT | [1.6, 2.4] | [−1.5, 0.4] | −0.247 ± 0.023 | 0.713 ± 0.012 | − | 0.175 ± 0.007 | − | − | 0.03 | 8.0 | 254 |
| g−r | [1.6, 3.1] | [−2.4, 0.4] | −0.263 ± 0.010 | 0.521 ± 0.005 | − | 0.079 ± 0.006 | 0.015 ± 0.004 | − | 0.03 | 8.8 | 465 |
| g−i | [1.6, 3.1] | [−1.4, 0.4] | 0.280 ± 0.084 | 0.057 ± 0.079 | 0.163 ± 0.018 | 0.063 ± 0.005 | − | − | 0.03 | 13.5 | 282 |
| r−i | [1.6, 3.1] | [−1.4, 0.4] | 0.236 ± 0.050 | −0.171 ± 0.047 | 0.095 ± 0.011 | − | − | − | 0.02 | 2.2 | 364 |
| G−W1 | [1.6, 3.2] | [−2.4, 0.5] | 0.099 ± 0.043 | 0.948 ± 0.040 | 0.019 ± 0.009 | 0.006 ± 0.004 | 0.007 ± 0.003 | − | 0.03 | 0.4 | 1666 |
| W1−W2 | [1.6, 3.2] | [−2.4, 0.5] | 0.065 ± 0.039 | −0.051 ± 0.038 | −0.014 ± 0.009 | 0.049 ± 0.015 | 0.007 ± 0.002 | −0.028 ± 0.008 | 0.02 | 0.1 | 1657 |
| W2−W3 | [1.6, 3.2] | [−2.4, 0.5] | −0.228 ± 0.032 | 0.240 ± 0.029 | −0.038 ± 0.006 | − | − | − | 0.03 | 0.1 | 1671 |
| H−W2 | [1.6, 3.2] | [−2.4, 0.5] | 0.025 ± 0.008 | 0.032 ± 0.004 | − | 0.009 ± 0.004 | 0.016 ± 0.003 | − | 0.03 | 0.4 | 1137 |
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