"mandible" <-
structure(list(females = c(120, 107, 110, 116, 114, 111, 113, 
117, 114, 112), male = c(110, 111, 107, 108, 110, 105, 107, 106, 
111, 111)), .Names = c("females", "male"), row.names = c("1", 
"2", "3", "4", "5", "6", "7", "8", "9", "10"), class = "data.frame")