... separated

In their recent reviev, Sandage & Tammann (2006) adopt a different classification. However, in the present paper we use the classical one.

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... parameter

This parameter is the number ratio of HB to red giant branch stars brighter than the HB level.

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... papers

The whole set of stellar models can be retrieved at the following URL site: http://www.te.astro.it/BASTI/index.php

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