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Fig. 1.
Histogram of redshifts for the 42 SNe IIn included in our sample, shown in red. The redshifts of the full PTF/iPTF sample of 111 SNe IIn is shown in blue. For comparison, the redshifts of the full PTF/iPTF yield of spectroscopically classified SNe (for z < 0.35) is shown in green.
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