Spectral index within the ALMA frequency coverage (from 211 GHz to 275 GHz) as a function of the intensity peak of the continuum emission at 242 GHz (see Tables 1 and 2). Filled circles depict the continuum sources found in Sgr B2(N), while open circles correspond to the sources identified in Sgr B2(M). The red area shows the spectral index regime expected for dust sources (from + 2 for optically thick dust emission to + 4 for optically thin dust emission). The light blue area shows the regime of spectral indices for ionized gas sources, ranging from − 0.1 for optically thin, homogeneous Hii regions (also indicated with a dark blue dashed line) to + 2 for optically thick sources. The vertical and horizontal lines show 1σ error bars for the spectral index and intensity peak.
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