...$_{\odot}$

The solar oxygen abundance is accepted as $12+\log~({\rm O/H}) = 8.66$ according to Asplund et al. (2004).

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... IRAF

IRAF: the Image Reduction and Analysis Facility is distributed by the National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under cooperative agreement with the National Science Foundation (NSF).

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... MIDAS

MIDAS is an acronym for the European Southern Observatory package - Munich Image Data Analysis System.

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