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Histograms of pollen viability (proportion viable pollen grains, averaged between two flowers per individual) in parental M. guttatus and M. nasutus lines (N = 56 and 98, respectively), F1 hybrids (N = 96), F2 hybrids (N = 388), M. guttatus-backcross (BG1) lines (N = 103), and M. nasutus-backcross (BN1) lines (N = 133).
