Radio continuum map of source W33 Main and G12.81−0.20 at 1400 MHz (left panel) and 610 MHz (center panel) after primary beam correction and rescaling. The contour levels in the 1400 MHz map are at 3σ and factors of 3 thereafter. The contour levels in the 610 MHz map start at 3σ with a linear step size of 5σ thereafter, where σ is rms noise in the maps equivalent to 0.91 mJy beam⁻¹ and 5.6 mJy beam⁻¹ at 1400 and 610 MHz, respectively. Right panel: GLOSTAR wide-band reference frequency (5.8 GHz) map overlaid with the GMRT 1400 MHz contour. The blue-filled ellipse shows the corresponding beam size.