 ![[*Top:*]{} Distribution of the [$\log g$]{} and $\alpha$ for the full sample. The color coding shows in red [$T_{\rm eff}$]{} $<$ 0000 K, in yellow 0000 K $<$ [$T_{\rm eff}$]{} $<$ 0000 K, in green 0000 K $<$ [$T_{\rm eff}$]{} $<$ 0000 K, and blue [$T_{\rm eff}$]{} $>$ 0000 K. [*Bottom:*]{} Residuals of the regression analysis scaled by the uncertainties in $\alpha$ as a function of [$T_{\rm eff}$]{}. \[fig:poster\_teffalpha\]](