Diagnostic diagram WHAN (Cid Fernandes et al. 2011) to distinguish star formation-dominated galaxies from AGNs for the LoCuSS mass-complete cluster and field galaxy samples. The star-forming region of the WHAN diagram is populated by 410 cluster galaxies and 227 field galaxies (SFgals sample, red, green, and cyan points) with rest-frames EW(Hα) > 3 Å and log([NII]/Hα)≤ − 0.3. The red symbols show the subsample of SFgals with R <  R₂₀₀. Mlow (Mhigh) galaxies shown as black symbols in the lower (upper) panels lie in the region occupied by Type-2 AGNs (SeyfLiners sample, see Table 2).