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\\An downa be disputed}  \\-- from \textit{A Dream} by Robert Browning, 1786  \end{quote}  (This can be translated as:  But \begin{quote}  (But  facts are fellows that will not be overturned, \\And cannot be disputed)  \end{quote}  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  This paper by three distinguished workers in the field of cardiovascular mechanics, concludes that both the reservoir pressure and instantaneous wave-free ratio are '... both physically incorrect, and should be abandoned'. These are very strong conclusions which, if they were opinions could only be debated. Reading the paper in detail, however, reveals that there it contains several factual errors in their discussion of these two entities. Since facts are different from opinions, I believe that it is essential that these errors be corrected before they gain credence by repetition.  The recent paper 'Wave separation, wave intensity, \begin{quote}  False facts are highly injurious to  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 progress  of factual errors that should be corrected. science, for they often endure long; but false views, if supported by some evidence, do little harm, for every one takes a salutary pleasure in proving their falseness.  \\-- Charles Darwin  \end{quote}