... clouds

Tables 4 to 15 are also available at the CDS in electronic form (ftp 130.79.128.5) or http://cdsweb.u-strasbg.fr/Abstract.html Figures 1 to 11 are only available at the http://www.edpsciences.org

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... IRAF

IRAF is distributed by National Optical Astronomy Observatories, which are operated by the Association of Universities for Research in Astronomy, Inc, under contract with the National Science Foundation, U.S.A.

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... clouds

The magnitudes are expressed in an arbitrary relative scale here and also for all the clouds to follow in the subsequenttables.

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