Table 5
Coefficients and standard deviation (in spectral subtypes) of the cubic polynomial fits of the five spectral-typing indices.
| Index | a | b | c | d | σ |
|
|
|||||
| TiO 2 | +11.0 | –22 | +28 | –20 | 0.83 |
| TiO 5 | +9.6 | –20 | +17.0 | –9.0 | 0.57 |
| PC1 | –50 | +97 | –59 | +12.4 | 0.52 |
| VO-7912 | –520 | +1300 | –1070 | +300 | 0.59 |
| Color-M | +1.98 | +13.1 | –15.6 | +10.3 | 0.53 |
Notes. We used the relation SpT(i) = a + bi + ci2 + di3 for the cubic fits. For the Color-M index we used the relation SpT(i) = a + b log i + c (log i)2 + d (log i)3.
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