Phase-space diagram for the Hα detected galaxies within the Virgo cluster. For all galaxies, the X-axis indicates the projected distance from the central galaxy M87 in units of r₂₀₀, and the Y-axis shows the excess in velocity with respect to the mean velocity of cluster A (⟨v⟩ = 955 km s⁻¹) normalised to its mean velocity dispersion (σ = 799 km s⁻¹; Boselli et al. 2014c). Late-type galaxies (> Sa) are indicated by black symbols, and early-type galaxies are shown by red symbols. Filled dots show HI gas-rich objects (HI-def ≤ 0.4), and HI-deficient objects (HI-def  >  0.4) are shown by empty circles. The solid lines delimit the different regions extracted from the simulations of Rhee et al. (2017) to identify galaxies in different phases of their infall into the cluster: first (not yet fallen), recent (0 <  τ_inf <  3.6 Gyr), intermediate (3.6 <  τ_inf <  6.5 Gyr), and ancient (6.5 <  τ_inf <  13.7 Gyr) infallers.