def calc_radius_center(self, delta_deg):
        return self.calc_radius_xy(float(2.0 / self.width),
                                   float(self.height / 2.0),
                                   delta_deg)
dataset/ETHPy150Open ejeschke/ginga/ginga/AstroImage.py/AstroImage.calc_radius_center/swapped operands of `/`