Results of bootstrap simulations. The w1 sample is compared with 1000 virtual w0_t,M CSs of ≈350 sources (six leftmost panels), and with 200 virtual (six rightmost panels). The panels show median values measured for the cluster members (thick solid lines) along with the distributions of the bootstrapped sample w0_t,M medians (left) and (right) and their medians (dot-dashed lines). Top: ratio R_Em (left) and ratio R_N (from DD_[NII]; right) for the revised classification (gray). The middle panels show the luminosity of Hβ in erg s^-1 (left), and the SFR in M_⊙ yr^-1 (only for Hii sources; right). Blue histograms and lines refer to average values of detections only, gray histogram and lines show medians and include upper limits. Bottom panel: distributions for [Oiii]λ5007/Hβ (left) and W(Hβ) (right), with the same meaning of color coding.