Same as Fig. 10, but now with the colour-coding measuring the spectroscopic success rate (SSR), i.e. the ratio of the number of reliably measured redshifts (i.e. quality flag ≥ 2) to the number of targeted galaxies. Also in this figure a few problematic areas emerge: purple and brown quadrants correspond to regions in which the fraction of successful measurements is, respectively, below 50% and 70%. As can be seen, for the majority of quadrants the success rate is larger than 80%