Phase-space diagram of the core of the Coma cluster surveyed in Hα. 200 Elliptical+S0 galaxies are indicated in red (except two with Hα tails in green), 10 LTGs without Hα extension are given with open symbols, and 17 LTGs with Hα tails are over plotted in blue, except NGC 4848 and the 3 galaxies analyzed in this paper shown with filled black symbols. The dashed line represents the escape velocity in a Coma-like cluster. We adopt for Coma R₂₀₀ = 2.19 Mpc and σ = 880 km s⁻¹ (Boselli & Gavazzi 2006).