Same as Fig. B.1, now for Δv_⋆ against colour excess E(B − V). In general we observe in the three regions of each galaxy almost vertical distributions. The only exception is the disc in NGC 1097 which present increasing values of Δv_⋆ with increasing values of E(B − V). Nevertheless, as we previously stated for other parameters, the trend is not reliable since the mean values of Δv_⋆ in each bin are comparable to the value of the typical error.