Observed SED of two of the Pilot Program sources, HerBS-58 (z = 2.084) and HerBS-89a (z = 2.950). The data include SPIRE (black dots, from Bakx et al. 2018), the revised SCUBA-2 photometry (blue dot, see Bakx et al., in prep.), and the 3 and 2 mm continuum flux densities (red dots) extracted from the NOEMA data (Table 3). In the case of HerBS-58, the PACS data point, which is available, is shown as an open square, although it was not used to fit the SED. The figure also shows the best-fitting MBB model including (red dashed) and not including (red dotted) the effect from the CMB on the dust continuum, and the best fit to the DL07 model (blue dashed); see text for details.