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New data from the NA61 collaboration on the production of negative pions inp+p interactions at beam momenta between 20 and 158 GeV/c are criticallycompared to available results in the same energy range. It is concluded thatthe NA61 data show some discrepancies with the previous results. This concernsin particular the total yields, the $p_T$ integrated rapidity distributions andthe double differential cross sections.

Comments concerning the paper "Measurement of negatively charged pion  spectra in inelastic p+p interactions at 20, 31, 40, 80 and 158 GeV/c" by the  NA61 collaboration