Galaxies from our parent sample in equatorial coordinates. The dashed black circle is the virial radius r₂₀₀. The fuchsia and yellow squared regions show the coverage of our DECam and HI measurements, respectively. Gray squares represent the galaxies that do not belong to the HαIR sample, but are members of Hydra I according to either 6dFGS or NED (see Sect. 2). Colorized markers are discussed in sections 3 and 4.6, where we separate our sample in three populations according to their star formation activity relative to the main sequence (see Section 3.2): starburst galaxies (SBGs), main sequence galaxies (MSGs), and quenching galaxies (QINGs). Yellow filled markers show those galaxies that were detected in HI.