Stellar mass versus oxygen abundance (upper panels) and the residual oxygen abundance (lower panels) as calculated from the best-fit M-Z relation from the field sub-sample (solid black line). The sample is divided between Hi normal galaxies (left panels, blue circles) and their Hi deficient counterparts (middle panels, red circles). We differentiate between field galaxies and Virgo cluster members using solid and open symbols, respectively. Mean metallicities in bins of fixed stellar mass (right panels) show a clear systematic difference between the Hi normal (blue squares) and Hi deficient galaxies (red triangles). Error bars show the 1-σ scatter in each bin.
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