Correlation coefficient and dipole mode χ_dip² as a function of the systematic errors of the estimated core and envelope rotation rates. Upper panels: Dipole mode χ_dip² as a function of the systematic error of the envelope and core rotation rate measured in units of the random errors of the individual inversions in the left and right panel, respectively. Lower panels: Same as upper panels for the splitting correlation coefficient ρ. The initial mass of the reference model is colour coded. Note that the y-axis increases downwards.