Getting the last number in a series before lowering it below threshold in R

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I have the following data:

dat<- structure(list(Pentad = 1:73, RR = c(0, 0.014285714, 0, 0.088571429, 
0.071428571, 0, 0.065714286, 0.028571429, 0.09428571


                      
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