A researcher ①examining the harbour records found a series of entries ②that had been altered after a dispute. The dates of the alterations, rather than the dates of the original shipments, ③were crucial to her argument. She considered ④it necessary to compare the ink with that used in neighbouring entries. Having completed the comparison, ⑤her explanation was revised to allow for a later intervention in the record. The final report distinguishes what the physical evidence shows from what the researcher regards as a plausible motive.