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Quantitative asymmetry, A, from crosses between centrarchid fishes with a fossil-calibrated phylogeny [adapted from Bolnick and Near's (2005) Figure 4, with corrections provided by D. I. Bolnick]. The data from each cross describe the mean hatch rate for hybrids divided by the mean hatch rate from intraspecific crosses. The y-axis is the difference between reciprocal crosses, and the x-axis is estimated divergence time in millions of years.
