`impala` <-
structure(list(id = 1:73, transect = structure(c(1L, 1L, 1L, 
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
1L, 1L, 1L, 1L, 1L, 1L), .Label = "AEME_OCT_1971_HEMMINGWAY", class = "factor"), 
    length = c(60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 
    60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 
    60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 
    60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 
    60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 
    60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 60L, 
    60L, 60L, 60L), raddist.m. = c(100L, 150L, 200L, 150L, 200L, 
    200L, 200L, 250L, 160L, 140L, 130L, 130L, 100L, 100L, 120L, 
    200L, 200L, 170L, 250L, 230L, 180L, 120L, 180L, 190L, 180L, 
    130L, 400L, 200L, 70L, 167L, 400L, 180L, 250L, 80L, 150L, 
    260L, 200L, 300L, 150L, 100L, 120L, 400L, 150L, 120L, 100L, 
    200L, 120L, 200L, 120L, 300L, 130L, 150L, 370L, 100L, 200L, 
    250L, 250L, 250L, 75L, 200L, 150L, 150L, 250L, 200L, 300L, 
    360L, 360L, 200L, 250L, 100L, 150L, 300L, 100L), angle = c(46L, 
    10L, 17L, 38L, 55L, 25L, 55L, 39L, 8L, 31L, 42L, 23L, 0L, 
    47L, 0L, 40L, 55L, 25L, 7L, 18L, 57L, 35L, 30L, 20L, 67L, 
    17L, 71L, 23L, 37L, 0L, 90L, 77L, 7L, 26L, 35L, 7L, 90L, 
    65L, 10L, 50L, 20L, 30L, 35L, 0L, 70L, 16L, 5L, 25L, 0L, 
    15L, 0L, 40L, 0L, 40L, 70L, 0L, 40L, 37L, 58L, 75L, 45L, 
    50L, 35L, 40L, 55L, 20L, 20L, 50L, 35L, 20L, 40L, 60L, 5L
    )), .Names = c("id", "transect", "length", "raddist.m.", 
"angle"), class = "data.frame", row.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", "51", "52", "53", "54", "55", "56", "57", "58", "59", 
"60", "61", "62", "63", "64", "65", "66", "67", "68", "69", "70", 
"71", "72", "73"))