Top panels: overlay of the VLA 7 mm (left) and 1.3 cm (right) continuum emission (contours) on the ALMA 1.4 mm continuum emission (colors) toward cores NE and Main core in G31. The black contours are −3 and the white contours 3, 6, 12, 30, 50, and 80 times 1σ, which is 0.025 mJy beam⁻¹ at 7 mm and 0.005 mJy beam⁻¹ at 1.3 cm. The 1.4 mm synthesized beam is shown in the lower left corner of the panels, and the 7 mm and 1.3 cm synthesized beams in the lower right corner. The names of the sources in which the emission of the Main core has been resolved are indicated. Bottom panels: same but overlaid on the ALMA 3.5 mm continuum emission (colors).