High sensitivity 21-cm H i line observations , with an rms noise level of \sim 0.5 mJy , were made of 35 spiral galaxies in the Coma Supercluster , using the refurbished Arecibo telescope , which resulted in the detection of 25 objects .
These data , combined with the measurements available from the literature , provide the set of H i data for 94 % of all late-type galaxies in the Coma Supercluster with an apparent photographic magnitude m _ { p } \leq 15.7 mag .
We confirm that the typical scale of H i deficiency around the Coma cluster is 2 Mpc , i.e .
one virial radius .
Comparing the H i mass function ( HIMF ) of cluster with non-cluster members of the Coma Supercluster we detect a shortage of high H i mass galaxies among cluster members that can be ascribed to the pattern of H i deficiency found in rich clusters .