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Fig. 2
Cumulative distribution of 92 Swift GRBs with Liso > 1051 erg s-1 in z = 0−4 (stepwise solid line). The dashed line shows the GRB rate inferred from the star formation history of Hopkins & Beacom (2006). The solid line shows the GRB rate inferred from the star formation history including (1 + z)0.5 evolution.
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