Fig. 3
Histograms of equivalent widths for UVES in blue and HARPS in green, expressed as percentages with the same X axis scale. All the UVES spectra results are shown apart from those for one which appeared to be just noise (12 March 2009 UTC 02:31:11). HARPS spectra are omitted for four outlying cases which appeared to be dominated by flares at 16 July 2004 UTC 01:52:40, 27 March 2011 UTC 05:20:09, 05 May 2013 UTC 03:31:16 and 5 May 2013 UTC 03:41:47 with values of 21.69, 18.12, 6.76 and 6.19 respectively.
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