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Table 1

General comparison of the obtained signals showing the advantages of different molecules for various spectral type investigations.

Spectral type Tphot/Tspot Minimum residual intensity Maximum Stokes V/Ic [%] Maximum Stokes Q/Ic [%]
TiO MgH CaH FeH TiO MgH CaH FeH TiO MgH CaH FeH
M 3500 K/2800 K 0.702 0.671 0.661 0.688 0.707 0.758 0.730 0.704 0.410 0.153 0.414 0.166
3500 K/3000 K 0.705 0.667 0.660 0.692 0.988 1.016 1.078 0.829 0.529 0.218 0.599 0.199
3800 K/3000 K 0.800 0.690 0.771 0.723 0.659 0.602 0.712 0.623 0.352 0.125 0.395 0.150
4000 K/3000 K 0.866 0.701 0.830 0.741 0.498 0.404 0.535 0.513 0.266 0.084 0.297 0.123
4000 K/3500 K 0.860 0.692 0.829 0.746 1.086 1.058 1.436 0.877 0.491 0.226 0.616 0.222
K 4200 K/3500 K 0.919 0.715 0.884 0.774 0.833 0.724 1.096 0.729 0.376 0.155 0.470 0.184
4500 K/3500 K 0.970 0.806 0.957 0.871 0.600 0.461 0.784 0.576 0.270 0.100 0.336 0.145
4500 K/3800 K 0.969 0.800 0.954 0.871 0.693 0.790 0.750 0.790 0.211 0.170 0.395 0.204
4800 K/3800 K 0.981 0.912 0.978 0.946 0.534 0.560 0.575 0.651 0.162 0.121 0.303 0.168
4800 K/4000 K 0.984 0.906 0.978 0.945 0.461 0.816 0.464 0.798 0.090 0.170 0.268 0.221
5000 K/3800 K 0.984 0.954 0.983 0.969 0.459 0.458 0.492 0.580 0.139 0.100 0.260 0.149
5000 K/4000 K 0.987 0.948 0.983 0.968 0.397 0.670 0.398 0.712 0.077 0.140 0.231 0.197
5000 K/4200 K 0.992 0.941 0.985 0.967 0.248 0.912 0.283 0.804 0.040 0.176 0.168 0.237
G 5500 K/3800 K 0.989 0.987 0.989 0.987 0.334 0.302 0.356 0.456 0.101 0.066 0.189 0.117
5500 K/4200 K 0.994 0.978 0.990 0.985 0.182 0.608 0.206 0.634 0.030 0.118 0.123 0.187
5500 K/4500 K 0.999 0.977 0.996 0.989 0.035 0.580 0.085 0.471 0.010 0.182 0.041 0.149
5800 K/3800 K 0.990 0.992 0.991 0.989 0.285 0.245 0.302 0.403 0.086 0.054 0.161 0.104
5800 K/4200 K 0.995 0.984 0.991 0.987 0.156 0.494 0.175 0.562 0.026 0.096 0.105 0.166
5800 K/4500 K 0.999 0.983 0.997 0.992 0.030 0.473 0.073 0.419 0.009 0.148 0.034 0.133
6000 K/3800 K 0.991 0.993 0.991 0.990 0.258 0.215 0.273 0.374 0.077 0.048 0.145 0.096
6000 K/4200 K 0.995 0.986 0.992 0.989 0.141 0.435 0.159 0.522 0.023 0.085 0.095 0.154
6000 K/4500 K 0.999 0.986 0.997 0.992 0.028 0.418 0.067 0.389 0.008 0.130 0.031 0.123
6000 K/4800 K 1.000 0.992 0.999 0.997 0.003 0.208 0.017 0.174 0.002 0.081 0.008 0.057

Notes. Calculations were made with various combinations of underlying models for each spectral type. We list the minimum residual intensity (I), Stokes V, and Stokes Q signals from the different molecular lines for a model star with vsini = 10 km s-1 and 10% of the longitudinal or transverse magnetic field of 3 kG. Tabulated maxima exclude excursions due to atomic lines that overlap the relevant molecular band.

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