Relation between δAU and δAV after ewSi correction (triangles up) and after ewSi and ewCa corrections (triangles down). The δAU are displayed with an added arbitrary constant. The ellipses represent the full measured covariance matrix between the two bands. They are enlarged by the additional subtraction error after ewCa correction. The result of the fits are also displayed. The and respectively correspond to the ones in Figs. 3b and c for the U-band.
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