Gaussian fits to the A+B combined data central spectrum. Fits are peak flux and line width: HCN ν = 0 line centre (63 mJy/beam, 250 km s^-1), line wings (7 mJy/beam, 840 km s^-1); HCN ν₂ = 1f (6 mJy/beam, 260 km s^-1); HCO⁺ (45 mJy/beam, 227 km s^-1). Since the A- and B-array data had a slight shift in centre frequency the edges of the band have been cut, leaving out the HOC⁺ detection at the blue end of the spectrum.