Left: Evolution of Z/W (solid lines) and Ly/W (dashed lines) ratios following an instantaneous (black) and Coulomb-collisions-mediated (red) increase in electron temperature from 7 to 28 keV (corresponding to ℳ = 3.2 shock). The dashed blue line shows the ratio for a kT = 7 keV CIE plasma. Right: Same as in the left panel but for an initial temperature of 6.5 keV and a final temperature of 12 keV (corresponding to a ℳ = 1.8 shock). While the Z/W flux ratio differs between the T_e = T_p and T_e < T_p cases, it remains lower than the CIE-predicted values. The evolution of the Ly/W ratio is driven primarily by time-dependent changes in the ionization balance.