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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def set_coordsys(self):
 """ Mapping to astropy's coordinate system name # TODO: needs expert attention (Most reference systems are not mapped) """

        if self.coordsys.lower() in self.coordsys_mapping:
            self.coordsys = self.coordsys_mapping[self.coordsys.lower()]