Fig. 4
Top panels: composite Ca ii K spectra towards each of the 7 clusters, formed by median combining the individual fibres after continuum normalisation. Bottom panels: 21-cm H i data taken from the GASS (full lines) and LABS survey (dotted lines) towards the FLAMES plate centres. a) NGC 330 (S/N~ 500; b) NGC 346 (S/N~ 900; c) NGC 1761 (S/N~ 1200; d) NGC 2004 (S/N~ 1000); e) NGC 3293 (S/N~ 800); f) NGC 4755 (S/N~ 800; g) NGC 6611 (S/N~ 500). Absorption-line features at ~ 50 km s-1 are caused by IV gas.
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