data(mosquito)
stack(mosquito, borders="#1A1A1A22", first.point=FALSE)
data(hearts)
stack(hearts, borders="#1A1A1A22", ldk=FALSE)
stack(hearts, borders="#1A1A1A22", ldk=TRUE, ldk.col="#1A1A1A55")
stack(hearts, borders="#1A1A1A22", ldk=TRUE, ldk.col=col.summer(4), ldk.pch=20)
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