Fabrication, Falsification, and Plagiarism

You are a co-author of a recent paper that was rejected from a journal. The referee made a number of good points that called into question a section of a paper. Your co-author, who is responsible for rewriting this section of the paper, has changed some of the data in this section to address the referee's comments. You are skeptical about these changes to the data, but don't have any specific knowledge of wrongdoing. Includes expert commentary.