library(copula)
persp(BB6Copula(c(1,1.5)), dCopula, zlim = c(0,10))
persp(surBB6Copula(c(1,1.5)), dCopula, zlim = c(0,10))
persp(r90BB6Copula(c(-1,-1.5)), dCopula, zlim = c(0,10))
persp(r270BB6Copula(c(-1,-1.5)), dCopula, zlim = c(0,10))
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