def add_rms_contours(self, levels=5, **kwargs):
        """Add constant centered RMS difference contours."""

        rs,ts = np.meshgrid(np.linspace(self.smin,self.smax),
                            np.linspace(0,2/np.pi))
        # Compute centered RMS difference
        rms = np.sqrt(self.refstd**2 + rs**2 - 2*self.refstd*rs*np.cos(ts))

        contours = self.ax.contour(ts, rs, rms, levels, **kwargs)
dataset/ETHPy150Open apache/climate/ocw/plotter.py/TaylorDiagram.add_rms_contours/swapped operands of `/`