Panel a: H₂CO and CH₃CN temperature maps derived with XCLASS at a threshold of 10σ. The black contours show the 1.37 mm continuum emission with levels at 5, 10, 20, 40, and 80σ (σ = 0.59 mJy beam⁻¹). The gray dash-dotted circle indicates the outer radius of the radial temperature fit (bottom panel). The beam size (0″. 47 × 0″. 36) is shown in the lower right corner of the H₂CO temperaturemap. Panel b: radial temperature profiles obtained from the data in the top panel. The data are binned in steps of half a beam size (~700 au) for H₂ CO (green data points) and CH₃CN (blue data points). A power-law fit was performed on spatial scales in the range 700− 4000 au to determinethe temperature power-law index q. The gray dash-dotted line indicates the outer radius of the radial temperature fit. At radii smaller than 700 au the temperatureprofile cannot be determined due to the finite beam size (gray shaded area). The transparent data points were excluded from the fitting. The best fit is shown by the red solid line. The error of the fit (one standard deviation) is shown by the red dashed lines.