... clusters

Table 3 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/486/9

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...

Visiting astronomer of the German-Spanish Astronomical Center, Calar Alto, operated by the Max-Planck-Institut für Astronomie, Heidelberg, jointly with the Spanish National Commission for Astronomy.

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... Observatory

CAHA, Centro Astronomico Hispano Alemán.

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... MIDAS

MIDAS, the Munich Image Data Analysis System is developed and maintained by the European Southern Observatory (ESO).

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... SDSS

Sloan Digital Sky Survey, http://www.sdss.org

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... equilibrium

It is probably not true for XDCS220, however for the sake of comparison it will be assumed that it is. VMF194 is also peculiar, but the differences may arise from another sources.

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... activity

The derivation of the $sS\!FRs$ is described in Appendix A.

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... ones

Here galaxies with $5>\ensuremath{W_0(\mbox{[O{\sc ii}]},\mbox{H$\alpha$ })} >0$ are also plotted. Galaxies with negative EWs were not used since the calculations yield unphysical (i.e. negative values) results.

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