... spectra

Based on data collected at the European Southern Observatory with the VLT-UT2, Paranal, Chile (ESO Program 073.D-0211).

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...

Full 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/464/953

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... age

A high He content for the blue HB stars of NGC 6388 is supported by the results of Moehler & Sweigart (2006).

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... IRAF

IRAF is distributed by the National Optical Astronomical Observatory, which is operated by the Association of Universities for Research in Astronomy, under contract with the National Science Foundation.

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...<4

This value is smaller than for the preceding bin because the edge of the Oz-Poz field was reached at this distance.

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... -0.1

As noticed in Paper II, most of the field stars should belong to the bulge. The line of sight toward NGC 6441 passes at about 1.1 kpc from the cluster center. However, the field star average metallicity might be biased by the selection procedure adopted, and should not be taken as representative of the bulge metal abundance in the direction toward NGC 6441.

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... paper

The list of stars not members of NGC 6441 can be obtained upon request from the authors.

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... $K-T_{\rm eff}(V-K)$ points

The rms scatter around this straight line is of about 80 K, which is consistent with a dispersion of 0.06 mag in the reddening values, to be compared with the 0.05 mag proposed by Layden et al. (1999) and Pritzl et al. (2001), on a much larger number of stars.

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