Systematic errors at maturity in the Drosophila population and in 1170 medflies studied in our previous work (29). The pattern for Drosophila is shown at top left, and that for medflies at top right. All onsets of reproduction are moved to the origin. Top: Averaged error scores for the first, second, third, etc., day of individual maturity as compared to the corresponding plateau level. Bottom: Number of mature flies. Bars represent 95% confidence intervals of the systematic errors.