Observation x y 1 -22 22 2 -33 49 3 2 8 4 29 -16 5 -13 10 6 21 -28 7 -13 27 8 -23 35 9 14 -5 10 3 -3 11 -37 48 12 34 -29 13 9 -18 14 -33 31 15 20 -16 16 -3 14 17 -15 18 18 12 17 19 -20 -11 20 -7 -22