This is paper No. 23 in a refereed journal based on data from the ISOGAL project.

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Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, The Netherlands and the UK) and with the participation of ISAS and NASA.

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Tables A.2 and A.3 are only available in electronic form at http://www.edpsciences.org

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Catalogue of magnitudes 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/453/535

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