Fig. A.1

Top: montage of the Heiiλ4686 (left), Heiiλ5411 (centre), and Heiλ5876 (right) residuals (individual spectra mean) for WR7, WR20, WR34, and WR37 (as indicated in the top left section of the top panel). For all cases, the scale factor of the ordinate is indicated in the top right-hand corner of the left column. HJD − HJD(2000) is indicated in the y-axis. Second from top: σ spectrum. Second from bottom: Σ (99%) spectrum. Bottom: mean spectrum.
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