Observed and modeled intensity maps at 1.1, 1.3, 2.9, and 8.1 mm. The modeled maps have smaller pixel sizes than the observed maps, but are convolved to the same beam sizes as the respective observations (shown as ellipses in the lower left corners). The contour levels in each residual image start at −3σ, 3σ in steps of 3σ with σ_1.1mm = 0.028 mJy pixel⁻¹ (1 pixel = 0.1″ × 0.1″ at 1.1 mm), σ_1.3mm = 0.019 mJy pixel⁻¹ (1 pixel = 0.1″ × 0.1″ at 1.3 mm), σ_2.9mm = 1.37 μJy pixel⁻¹ (1 pixel = 0.05″ × 0.05″ at 2.9 mm), and σ_8.1mm = 0.038 μJy pixel⁻¹ (1 pixel = 0.01″ × 0.01″ at 8.1 mm) in the observations. Solid green and dotted blue lines show the directions of major and minor axes in the observation and simulation panels (cf. Fig. A.2). The central compact emission within the red-dashed ellipse at 8.1mm residual map was masked for fitting (see details in Sect. 3.7).