Based on observations made with the Carlos Sánchez Telescope operated on the island of Tenerife by the Instituto de Astrofísica de Canarias (IAC) in the Observatorio del Teide, Izaña.

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Appendix A is only available in electronic form at http://www.aanda.org

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... fluxes

The use of IRAS-PSC magnitudes varies in the literature. Both zero point corrected and not zero point corrected values are found. To avoid confusion, for this paper we defined a zero point corrected [x $\mu$ m $] \equiv -2.5 \cdot \log (F / F_{0})_{x~\mu{\rm m}}$ . The F₀-values were taken from the IRAS-PSC.

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