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\begin{center} \begin{quote}  \textit{But facts are chiels that winna ding  \\An downa be disputed}  \\-- from textit{A \textit{A  Dream} by Robert Burns, 1786. Browning, 1786  \end{quote}  (This can be translated as: 
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\end{center}  The recent paper 'Wave separation, wave intensity, the reservoir-wave concept, and the instantaneous wave-free ratio' (2015) N Westerhof, P Segers and BE Westerhof, Hypertension, DOI: 10.1161/HYPERTENSIONAHA.115.05567 contains a number of factual errors that should be corrected corrected.