SPIRE maps at 250, 350, and 500μm for a lensed source. In this case a single very bright SPIRE source is detected. This source is confirmed at the Jy level and has a redshift of z = 3.0, measured from multi-line spectroscopy acquired at IRAM using EMIR (Canameras et al., in prep.). The white contour is the Planck IN region, defined in the same way as in Fig. 1. These data come from a 7′ × 7′ SPIRE scan (see Table 1 and Sect. 2.3).