P(Model|data): approximate posterior PDF for the variants (see Table 2) given the adopted prior (see text). We obtain these results when using as observational data the stars in Tycho-2 catalogue with visual apparent magnitude V_T < 11. Variants whose names end with “-D” use the extinction maps from Drimmel & Spergel (2001) while names ending with “-M” use those from Marshall et al. (2006). With a dotted blue line we show the adopted prior PDF.