@classmethod<EOL><INDENT>def parse_affine(self, hdat, dataobj=None):<DEDENT>
if '<STR_LIT>' in hdat: return to_affine(hdat['<STR_LIT>'])<EOL>else:                return to_affine(self.default_affine())<EOL>
Parses the affine out of the given header data and yields it.