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Table 3
Best-fit correlations between 12 absorption line indices and the ugirz colours of stellar populations of the BC03 model.
| Best fit correlation | σ | Colour range [mag] | |
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| CN1 = −0.011−0.341 (u − i)+0.202 (u − i)2 − 0.028 (u − i)3 | 0.026 | 0.50 ≤ (u − i) ≤ 4.00 | |
| CN2 = 0.090−0.425 (u − r)+0.261 (u − r)2 − 0.039 (u − r)3 | 0.020 | 0.50 ≤ (u − r) ≤ 3.47 | |
| Ca4227 = 0.012+0.110 e(g−r)/0.290 | 0.140 | −0.56 ≤ (g − r) ≤ 1.02 | |
| G4300 = −9.681+8.353 (u − i) − 1.087 (u − i)2 | 0.584 | 1.00 ≤ (u − i) ≤ 4.00 | |
| Mg1 = −0.002+0.007 e(g−z)/0.610 | 0.012 | −1.32 ≤ (g − z) ≤ 1.95 | |
| Mg2 = −0.005+0.033 e(g−z)/0.795 | 0.021 | −1.32 ≤ (g − z) ≤ 1.95 | |
| Mgb = −0.206+0.764 e(g−z)/0.956 | 0.298 | −1.32 ≤ (g − z) ≤ 1.95 | |
| HδA = 12.436−17.446 (g − r) | 1.050 | 0.10 ≤ (g − r) ≤ 1.02 | |
| HγA = 10.701−20.424 (g − r) | 1.214 | 0.10 ≤ (g − r) ≤ 1.02 | |
| HδF = 7.503−8.613 (g − r) | 0.642 | 0.10 ≤ (g − r) ≤ 1.02 | |
| HγF = 7.639−11.328 (g − r) | 0.677 | 0.10 ≤ (g − r) ≤ 1.02 | |
| Dn(4000) = 0.754 + 0.315 e(u−r)/1.711 | 0.051 | −0.99 ≤ (u − r) ≤ 3.47 | |
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