Table 1: Mean absolute errors on the evaluation set of 908 spectra in the SS model for different numbers of PCs retained in the reconstruction. (As PCA is done separately on the blue and red regions, the total number of inputs is twice the number of PCs.).
PCs $E_{\log ~T_{\rm eff}}$ $E_{\log ~g}$ $E_{\rm [Fe/H]}$

5 0.0087 0.1264 0.1558

25 0.0036 0.0245 0.0327

100 0.0030 0.0251 0.0269

908 0.0133 0.2087 0.2308

**Table 1:** Mean absolute errors on the evaluation set of 908 spectra in the SS model for different numbers of PCs retained in the reconstruction. (As PCA is done separately on the blue and red regions, the total number of inputs is twice the number of PCs.).
PCs	$E_{\log ~T_{\rm eff}}$	$E_{\log ~g}$	$E_{\rm [Fe/H]}$
5	0.0087	0.1264	0.1558
25	0.0036	0.0245	0.0327
100	0.0030	0.0251	0.0269
908	0.0133	0.2087	0.2308

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