fheights <-
structure(list(heights = c(54L, 55L, 56L, 56L, 57L, 58L, 58L, 
59L, 60L, 60L, 60L, 61L, 61L, 62L, 62L, 63L, 63L, 63L, 64L, 65L, 
67L, 67L, 69L, 73L)), row.names = c(NA, -24L), class = c("tbl_df", 
"tbl", "data.frame"))