Spectrum taken across the 3 mm (Barnes et al. 2021) and 1 mm spectral windows towards the C2c1 (blue) and C2c5 (orange) cores. Shown as coloured lines is the spectrum averaged within the boundary of the cores, and the coloured shaded regions indicate the uncertainty (rms). The spectrum of the C2c5 core has been offset by +0.1 K to allow comparison. Several prominent lines within the spectral windows, which are summarised in Table 2, are labelled.