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Tables 1-7 in this appendix show the fraction (labeled with an ''F") and number (labeled with an "N") of graduates in a particular cohort (for example, 1–2 years after receipt of the PhD) who hold various types of positions. The matrix example on the following page illustrates how these career-progress matrices are to be read. Note that tables include only persons who at the time of doctorate were US citizens or permanent residents.