...5

Visiting Astronomer, Kitt Peak National Observatory. KPNO is operated by AURA, Inc., under contract with the National Science Foundation.

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...$d\approx 3.0$ kpc

The data presented in Fig. 1 are available in electronic form at the CDS, via ftp 130.79.128.5.

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...package

IRAF is distributed by the National Optical Astronomical Observatories, operated by AURA, Inc., under contract with the National Science Foundation.

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...projected

It has been kindly pointed out by Dr. K. Janes, the referee, that paucity of the backgroung stars in the observed field may bias the apparent location of the cluster main sequence. Using the observed density profile of the cluster (see Sect. 4) one may conclude that, in fact CMD based on the data from runs #1 and #2 are strongly dominated by the cluster members.

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