fitting procedure reproduces best all observed spectra. Therefore, we conclude that the physical parameters derived from this option are the most probable.

We list the model-dependent physical parameters in Table \[tab\_MplusTeff\_sdM:table\_param\] and display the best fits provided by the synthetic SEDs (red lines) to observed X-shooter spectra (black lines) for each metal class in Appendix \[MplusTeff\_sdM:appendix\_model\_fits\].

We have also looked at the physical parameters derived from the model fit to the optical region of the X-shooter spectra (600–1000nm) from which the spectral classification of subdwarfs is based [@gizis97a; @lepine07c]. We find that on average the optical spectra give equal or cooler effective temperatures, lower gravites, and/or lower metallicities (Table \[tab\_MplusTeff\_sdM:table\_best\_fits\_VV\] in Appendix \[MplusTeff\_sdM:appendix\_model\_fits\]).

[@c @c @c c c c c c c c c c c c c c c@]{} & & & & SpT & RV & $\log$g & T$_{\rm eff}$ & \[Fe/H\] & Mass & RV & $\log$g & T$_{\rm eff}$ & \[Fe/H\] & Mass & RV & $\log$g & T$_{\rm eff}$ & \[Fe/H\] & Mass & km// & dex & K & dex & M$_{\odot}$ & km/s & dex & K & dex & M$_{\odot}$ & km/s & dex & K & dex & M$_{\odot}$ M0.0 & 