Nuclear composition of the accreted material at the neutron star surface (blue line) and at ignition depth (red line) after the settling phase simulated using the NucNet Tools single-zone reaction network code. The lower panel in each subfigure shows the abundance ratio in each isotopic abundance between ignition and accretion depth. Binary system parameters are as follows: (a) X_H,acc = 0.7, Z = 0.02, and ﹩\dot{m}=0.1{\dot{m}}_{{\rm{Edd}}}﹩; (b) X_H,acc = 0.7, Z = 0.01, and ﹩\dot{m}=0.1{\dot{m}}_{{\rm{Edd}}}﹩; (c) X_H,acc = 0.7, Z = 0.02, and ﹩\dot{m}=0.5{\dot{m}}_{{\rm{Edd}}}﹩; (d) X_H,acc = 0.3, Z = 0.02, and ﹩\dot{m}=0.1{\dot{m}}_{{\rm{Edd}}}﹩. The insets in each panel show the abundance ratio (y_ign/y_acc) for highlighting the change in ¹H and ⁴He prior to ignition.