@classmethod<EOL><INDENT>def get_feh(cls, filename):<DEDENT>
X,Y,Z = cls._get_XYZ(filename)<EOL>Xsun = <NUM_LIT><EOL>Zsun = <NUM_LIT><EOL>return np.log10((Z/X) / (Zsun/Xsun))<EOL>
example filename: yapsi_w_X0p602357_Z0p027643.dat