Comparison between dust continuum and line emission integrated between 0 and 60 km s^-1. The red and blue contours show the positions of the cores detected in SMA dust continuum (blue and red for 1.3 and 1.37 mm respectively, see Fig. 3). A representative synthesised beam of 4.3′′ × 2.9′′, PA = 0° is shown in the bottom left corner. The greyscale shows the SMA line emission (combined with IRAM 30 m in the case of ¹³CO) integrated between 0 and 60 km s^-1 for six lines: ¹³CO, C¹⁸O, CH₃OH 4(2, 2)–3(1, 2)-E, SiO, HNCO and H₂CO 3(0, 3)–2(0, 2). The lines are shown with stretches 5–10 mJy beam^-1 km s^-1 for ¹³CO, 3–14 mJy beam^-1 km s^-1 for C¹⁸O and CH₃OH, and 3–10 mJy beam^-1 km s^-1 for the remaining lines.