Diagnostic diagrams of [Oiii]λ5007/Hβ vs. [Nii]λ6583/Hα. Leftmost panel: DD for galaxies that are cluster members; second panel from right: same, for w0. The third and fourth panels from right show one realization of w0_t,M and of . Blue, red, and magenta colors identify Hii, LINERs, and Seyferts, respectively. Gray data points identify transition objects. Arrows indicate data points for which upper and/or lower limits to the diagnostic emission line ratios are considered. The bottom rows show panel for detections ordered in the same sequence. Median errors at a 1σ confidence level are shown in the upper right corner of the diagrams with detections only.