Comparison of the A_V derived here for the targets (Sect. 3.2) with those reported in the literature. The latter are shown with cyan squares in the case of values derived by N06 and in black circles when from other works (see Table A.1 for the references). The dotted lines show the ±1 mag difference between the two values. One sigma uncertainties in our estimates are reported, and are sometimes smaller than the symbol.