Abstract
On the basis of the data taken from both the Edinburgh/Durham Southern Galaxy Catalogue and the COSMOS-machine-scanned parameter set of the R plate images of the UK Schmidt Telescope Survey field 349, a statistical analysis of the distribution of galaxies with different colours in 4 clusters is presented. It is shown that the fraction of blue galaxies, f b , is smaller in the inner parts than in the outer parts of these clusters and is larger in the field than in the cluster regions. The possible implications of some features in the f b distribution are briefly discussed.
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