Spatial distribution maps of gas and dust. Left: zoomed spectra of ER61 showing in red boxes the wavelength ranges used to produce the dust, C₂, CN, and NH₂ spatial distribution maps (from top to bottom). Centre: maps of the dust, C₂, CN, and NH₂ spatial distribution built using a single data cube. We drew contours to guide the eye. Right: maps of the dust, C₂, CN, and NH₂ spatial distribution after division by an azimuthal median. The images are oriented with the south at the bottom and the west to the right. The red arrow indicates the anti-sunward direction. The bright trail in the dust maps is a star trail.