Hanning-smoothed molecular spectra toward molecular zone A (thick line; offset position (− 0.42″, − 0.43″)) and B (thin line; offset position (− 1.89″, − 1.78″)). The compact-configuration dataset and natural weighting is used for all molecules except CS 7–6, SO N_J = 8₈–7₇ and HCN 4–3 which are taken from the combined dataset using natural weighting but convolved to the beam size of the compact dataset (, PA − 12°). The apparent offset in velocity seen in ³³SO and ³³SO₂ is due to the blending of hyperfine transitions for which the reference velocity is set to the transition with lowest frequency (see Table 2).