Integrated intensity images of H₂CO (3_0.3–2_0.2) and SO(5₅–4₄), before primary beam correction, are shown on the left and right, respectively. Primary beam FWHM sizes are represented with filled dashed white circles in each image. The blue star represents the location of Per-emb-50. Beam sizes are represented by white ellipses in the bottom left corner of each image. Left: H₂CO(3_0.3–2_0.2) integrated intensity between 5.5 and 9.5 km s⁻¹. Red and blue contours correspond to the redshifted and blueshifted emisions coming from the outflow, respectively, traced in our wideband ¹²CO(2–1) emission. Contour levels are shown at 8, 16, and 24 K km s⁻¹. The white contour represents the continuum emission at a 7 mJy beam⁻¹ level (see Fig. A.1). Right: SO (5₅–4₄) integrated intensity between −1 and 14 km s⁻¹.