Total visibility plotted as a function of the effective temperature T_eff, for log g = 4.5 and [M/H] =  +0.0. The solid line shows the complete computation, the dotted-dashed line corresponds to the simplification of M09, the dashed line shows the approximated results obtained by using integrated g_K LD profiles. The red dashed line is obtained by using the LD laws published by Sing (2010).