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Relationships between horn length and fighting force (dark grey points; R2 = 0.48, F1,275 = 252.2, p < 0.001; fighting force = 0.12 × horn length + 0.94) and breaking force (open circles; R2 = 0.08, F1,74 = 6.05, p = 0.02; breaking force = 0.32 × horn length + 14.74).
