Spectral energy distributions of the objects PP 13 S (top left), Re 50 N IRS 1 (also known as HBC 494) (top right), V1647 Ori (middle left), V346 Nor (middle right), V733 Cep (bottom left), and V883 Ori (bottom right). Data shown as in Fig. 1. The SED of faint objects (here V1647 Ori and V733 Cep) is complemented with low-resolution spectra from SPIRE (thick orange and purple lines at the same wavelength window as the high-resolution spectra).