  The percentile-based rating scale P100 describes the citation impact in terms
of the distribution of unique citation values. This approach has recently been
refined by considering also the frequency of papers with the same citation
counts. Here I compare the resulting P100' with P100 for an empirical dataset
and a simple fictitious model dataset. It is shown that P100' is not much
different from standard percentile-based ratings in terms of citation
frequencies. A new indicator P100'' is introduced.

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