def get_frame(self, n):
        return self.fb[n]
:see: AbstractExpression.get_refs()
dataset/ETHPy150Open ejeschke/ginga/ginga/misc/plugins/IRAF.py/IRAF.get_frame--crossover with--dataset/ETHPy150Open nltk/nltk/nltk/sem/drt.py/DRS.get_refs