Nuclear spectral energy distribution (SED) of the Circinus galaxy. Blue points are high resolution photometry compiled by Prieto et al. (2010) plus additional measurement with ALMA (see Table 3). Also shown are low resolution measurements (cyan crosses). A power-law fit to the radio continuum data (blue dashed line) yields a slope of α = −0.41 ± 0.04. Modified blackbody emitters for warm dust (T = 130 K and β = α − 2 = 0.8, dashed line) and cold dust (T = 20 K and β = 1.4, continuous line) are shown in magenta. Also plotted is the SED of the model from Stalevski et al. (2019). We also show for comparison flux measurements and a power-law fit (α ∼ 4.2) for the emission in the head of the north-eastern spiral arm (dark green).