Continuum images at 2 mm (right) and spectra from the 2 mm (top) and 3 mm (bottom) bands of the Herschel bright galaxies HerBS-54, HerBS-58, and HerBS-79. Continuum contours are plotted starting at 2σ in steps of 1σ for HerBS-54 [232], 3σ in steps of 2σ for HerBS-58 [52], and 2σ in steps of 1σ for HerBS-79 [297], where the numbers in brackets are the local noise levels σ for each source in μJy beam⁻¹. See caption of Fig. 3 for further details.