Fig. 14.
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Montage of the Pa-11 line in W36 (P = 3.18 days, left panel) and W53a (right panel). Horizontal lines represent the continuum level at each epoch, and the vertical line represents the mean Pa-11 RV for stars in Westerlund 1. Spectra have been rebinned and filtered to reduce noise, and gaps indicate sky line removal as described in Sect. 3.2.
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