Panel (a): T-dependence of absorption cross sections (cm²/molecule) of methane in the central part of the tetradecad at eight temperatures 295, 300, 400, 500, 600, 700, 800, 900, and 1000 K: medium resolution (R = 0.2 cm⁻¹) simulations of observations (up) and theory (down). Panel (b): T-dependence of methane absorbance in the strong tetradecad range at eight temperatures 295, 300, 400, 500, 600, 700, 800, 900, and 1000 K: expanded cross-section simulations under medium resolution (R = 0.2 cm⁻¹) of observations (up) and theory (down).