Variation of χ² of the fit to the Stokes QU profiles with inclination i and azimuth angle Θ. The contours plotted with thick (red) lines show the 2%, and 5% increase from the minimum indicated with a ʏ symbol for the Fe and Cr lines. The contours plotted with dashed (blue) lines show the same for the rare earth lines, the minimum in this case is indicated with a ⋎ symbol. The × symbol indicates the adopted values of i and Θ.