Temporal trends in gender of PhD students, split across narrow research field and mentor gender.

Colors indicate mentors’ gender and time of graduation. Field abbreviations are reported in the key at lower right. The consistent pattern of homophily is reflected in the greater fraction of women trainees of women mentors (red), shifted up relative to trainees of men mentors (blue). The data and code needed to generate this figure are available on Zenodo (DOI: 10.5281/zenodo.4722020). (TIF)