Fig. 6
Observed variation of the Balmer decrement C(Hβ) as a function of the Hα (upper panel) and Hβ (bottom panel) equivalent widths, in Å. Red symbols indicate HI-deficient cluster galaxies (HI − def > 0.4), blue ones HI-normal, field objects (HI − def ≤ 0.4). Filled symbols indicate galaxies hosting an AGN, empty symbols normal galaxies. The typical uncertainty on C(Hβ) ranges from ∼ 0.3 for EW Hβabs > 2 Å to 0.5 below.
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