Left column: Planck 353GHz (top row), (middle row), and (bottom row) power spectra in units of computed over SGC34 using the subsets of the Planck data. See text calculation of 1σ error bars. The best-fit power law assuming exponent −2.3 is plotted for each power spectrum (dashed blue line). For comparison, we also show the Planck 2015 best-fit ΛCDM expectation curves for the CMB signal (Planck Collaboration XIII 2016), with the TE expectation shown as dashed where it is negative. Extrapolations of the dust power spectra to 150GHz (see text) are plotted as dashed red lines. Right column: similar to left panels, but for the dust model (Sect.5.4).