Relative systematic errors of the envelope rotation rates as a function of luminosity for MOLA and eMOLA inversions, shown with light and dark red points, respectively. The bump luminosity is shown with vertical dotted grey line. The upper panel shows the core step profile, in which eMOLA virtually eliminates the systematic errors that are present in the MOLA inversions. The lower panel shows the convective power law profile. The errors from eMOLA are generally much smaller than those from MOLA.