Map of the CH₃CN(12–11) line emissionaveraged over the K = 0 and 1 components (contours) overlaid on the map of the velocity in the same line, obtained by simultaneously fitting the K = 0–4 components as explained in the text. Labels A1 and A2 mark the center positions of the corresponding cores. Contour levels range from 9.5 (5σ) to 57 in steps of 9.5 mJy beam⁻¹. The dotted and dashed LINES indicate the approximate directions of the two velocity gradients.