Curve of flux growth in Circinus of APEX CO(3–2) and ALMA CO(1–0) (from Zschaechner et al. (2016)) emission within apertures of radius in increasing steps of 3.2″ for ALMA, and 3″ for APEX, respectively. The ALMA data was rescaled in flux density to CO(3–2) assuming a luminosity ratio of r₃₁ = 0.31 ± 0.11, and multiplying by the squared ratio of the rest frequencies of CO(3–2) (ν_rest = 345.796 GHz) and CO(1–0) (ν_rest = 115.271 GHz). The error bars for the ALMA data include a 5% calibration uncertainty for Band 6 data, but a significant fraction of the error mainly arises from the assumption of the line luminosity ratio r₃₁, which is ∼35%. The vertical dashed black line corresponds to the maximum recoverable scale of the ALMA data which is 22″, and is set by the shortest baseline length in the observing configuration.