Comparison of He abundances for a sample of 67 stars in common with the literature and 48 stars independently analysed for this work using the code MAUI. The open symbols refer to stars for which we have provided a Q2 or Q3 quality flag to the FASTWIND fits (see Tables D.1 to D.3). The 1-to-1 relation and 25% tolerance region are shown as dashed and dotted lines, respectively. The cross in the top left corner indicates the typical uncertainties in the Y_He estimates.