HI mass as a function of the stellar mass for SDSS/ALFALFA galaxies (in blue) and (e)LARS galaxies for objects classified as interacting and non-interacting. We show the position of Lyα-emitters with EW_Lyα > 20 Å on the top panel and weak or non-emitters on the bottom panel. The square blue markers show the median in bins of stellar mass for SDSS/ALFALFA galaxies. Circles indicate galaxies not identified as undergoing gravitational interaction, while stars show the objects classified as interacting. Only galaxies observed in 21 cm are shown here.