Centre: continuum map of the CMZ of NGC 253 at 362 GHz with a coloured scale indicating the emission in Jy beam⁻¹. The numbered circles represent the brightest points of each GMC detected by Leroy et al. (2015). The synthesised beam of the observations (1.6″) is shown in the lower left corner of each panel with a white hatched circle. Left: zoomed in view towards GMC 6 of the integrated emission between 120 and 240 km s⁻¹. Right: zoomed in view towards GMC 4 of the integrated emission between 220 and 260 km s⁻¹. Figures on the sides have their integrated emission scale in mJy beam⁻¹ km s⁻¹ starting at 2σ. The white dashed contour levels indicate the continuum emission for 0.1, 0.2, and 0.3 Jy beam⁻¹. Solid white contours indicate 2σ, 3σ, 4σ and 5σ levels of the PN detection.