Quantitative shift in peak energy due to redshift (z) from the local ATM24 model spectrum to ray-traced (RT) spectrum for T_eff = 2 × 10⁷ K and log(g) = 14.34. The red box shows the redshift calculation from the standard relation between the energy of the local intensity peak E′, marked by the vertical dash-dotted black line, and energy of the observed intensity peak E, marked by the vertical red line of the same style.