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The PHOENIX stellar model (or PHOENIX or PHOENIX code) is a computer model of the photosphere of a star. It was developed in the early 1990s with considerable improvement since. Through simulation, it gives a model spectrum of a star given some basic stellar characteristics. The code is sufficiently general to be used for planetary atmospheres, I assume specifically modeling their absorption. The PHOENIX code was developed using an earlier code, SNIRIS, both of which were used for modeling expanding photospheres such as those of novae and supernovae.