Redshift distribution of our 1.1 mm-selected sample (left panel), 870 μm-selected sample (middle panel), and the two samples combined (with sources present in both samples counted only once; right panel). In the middle panel we also show the redshift distribution of our S/N_{1.1 mm} > 4.5 PdBI-detected LABOCA sample (hatched histogram). Mean redshift values, and corresponding errors obtained using the statistical package ASURV, as well as the number of sources in each sample are indicated in each panel. Mean redshifts for every sample distribution are also indicated by the thick vertical lines.