Pixel-by-pixel χ_red² maps at 25″ resolution; bottom-left corner). Left panel: χ_red² from the NIR-to-radio SED fitting with THEMIS. Right panel: χ_red² from the FIR-to-radio (λ ≥ 100 μm) SED fitting with a single-T MBB. Insets show the χ_red² distribution. The dashed black vertical lines indicate a χ_red² = 1. Solid cyan lines represent the SPIRE 350 μm contours at [5, 15, 35, 55]×σ.