Profile of the average hydrogen bonds, nHb, for the liquid-vapor interfacial system as a function of distance from the Gibbs Dividing Surface at X=0.1 (panel a, c) and X=0.2 (panel b,d) mole fraction. Methanol hydrogen bonds are contributed by methanol-methanol(M-M) and methanol-water(M-W) interactions showed in upper panels (a, b); water hydrogen bonds have water-water (W-W) and methanol-water (M-W) contributions (lower panels c, d)