...1,2,

CAUP Support Astronomer, during year 2000, at the Isaac Newton Group of Telescopes, Sta. Cruz de La Palma, Spain.

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... curve

This is only true if F is a monotonous function of T. As can be seen from Fig. 5 this is true for almost all its domain.

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... efficiency

The dust absorption efficiency is related to the dust absorption cross-section by $\sigma_{a,\nu}^{\rm abs}=\pi a ^2 Q_a^{\rm abs}(\nu)$.

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