`catbird.y` <-
structure(c(0L, 0L, 2L, 7L, 1L, 6L, 3L, 0L, 1L, 3L, 0L, 2L, 0L, 
4L, 1L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 3L, 
0L, 0L, 1L, 4L, 2L, 3L, 0L, 0L, 0L, 0L, 0L, 2L, 2L, 1L, 0L, 0L, 
0L, 3L, 0L, 0L, 0L), .Names = c("1", "2", "3", "4", "5", "6", 
"7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", 
"18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", 
"29", "30", "31", "32", "33", "34", "35", "36", "37", "38", "39", 
"40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "50"
))