Left: Sgr B2(M) spectral density distributions for the ALMA continuum sources shown in Fig. 5 and listed in Table 1. Each gray dot corresponds to the integrated flux over the area of each source, when the flux is above the 3σ detection threshold. The fluxes at different frequencies are listed in Table B.2. The solid line is a linear fit to the data, with α corresponding to the spectral index (Sν ∝ να). Right: averaged spectrum over the 3σ-level polygon that defines the source, corresponding to the frequency range 211–213 GHz. Note that the intensity scale of the top panel is adjusted to better show the line features, while the scale in the bottom panel has been fixed for all the sources to show the relative brightness of the spectral lines between sources.
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