Because of a production error, the Oct. 14, 2008 story “Gender Ratios Vary Widely Across MIT Courses” incorrectly described the coloring of a chart showing graduate student gender ratios by major as “mostly magenta.” In fact it is mostly cyan, indicating that the composition of many graduate programs is more heavily male. Also because of a production error, the article incorrectly stated that the chart for undergraduates “has slightly more cyan than magenta” because women are the majority in more departments; in fact, that chart has more magenta than cyan for that reason.