Effects of different absorption models on the best-fit results. Top-left and top-right panels: Column density of neutral absorption of the warm-hot (left) and 0.7 keV (right) components in the multiple-layer model. Same colours and symbols as in the top-right panel of Fig. B.1. The column density of the 0.7 keV component is unconstrained and often pegged at very low values or the total Galactic column density. Bottom panel: Correlation for the multilayer absorption model. Despite the unconstrained column density of the 0.7 keV component inducing a larger scatter in the best-fit surface brightness of the 0.7 keV emission, the correlation with the stellar mass surface density persists with a correlation coefficient (L/M) consistent with the single-layer model.