... ESO-Paranal

Based on observations made with ESO Telescopes at Paranal Observatory.

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... IRAF

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

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... asl

The upper limit is set just for numerical reasons.

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... model

http://modelweb.gsfc.nasa.gov/models/msis.html

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