183 GHz H2O emission towards NGC 4945: (top) data were binned to 40 km s-1 resolution; (bottom) data were binned to 25 km s-1 resolution. The red arrow indicates the approximate galactic systemic velocity of 556 km s-1. The dashed lines indicate the velocity range of 22 GHz H2O megamaser emission determined by Greenhill et al. (1997), about 410 to 800 km s-1. The velocities are radio heliocentric in Greenhill et al. (1997) and so we use vLSR = vhel−4.6 km s-1 to convert velocities. The black arrow denotes the velocity of a marginally significant feature in the 321 GHz spectrum reported by Hagiwara et al. (2016) (the strongest features at 321 GHz occurred between about 650 to 750 km s-1). The velocity scale is radio LSR.
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