HCN, C₂H₂, and CH₄ bands in IRAS 07251−0248 observed with JWST MIRI/MRS, and model fit. Abscissae are rest wavelengths in μm. Panels a and c show the observed spectra around 7.5 and 14 μm (flux densities in mJy), with the orange line indicating the adopted continuum level (i.e., the baseline) and the light-blue curve showing the contribution to the continuum by the W_C. Panels b and d show the continuum normalized spectrum, with the red line showing the model result and the dashed line indicating the covering factor of the hot component (f_hot). The contributions to the model by HCN, C₂H₂, CH₄, and CO₂ (and their transition labels) are indicated in light-blue, magenta, green, and brown, respectively (and vertically shifted for clarity). Note that all absorption features are blueshifted relative to the labels.