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Fig. 5


a) Ratio of the intrinsic τV,   ISM derived by the model over the observed (attenuated spectrum) τV,   obs versus the τV,   obs. The dashed line is the one-to-one ratio. The red circles represent the early-type galaxies in HCGs, and the blue diamonds the late-type ones. b) Ratio of the intrinsic τV for stars in birth clouds, derived by the model over the observed τV,   obs versus the τV,   obs, using the same notation. We excluded 6 galaxies from the plot (HCG44a, HCG47a, HCG47b, HCG56b, HCG59a, and HCG68a) since their χ2 of model-fit was more than 9.00 and the derived τ fairly uncertain (see Table 3).

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