sample data

#x y z
200 50 2.17178
250 60 2.1927
150 40 2.25291
300 70 2.25647
100 20 2.28344
400 80 2.28813
500 90 2.31609
500 80 3.9603
400 70 4.15952
300 80 4.33325
150 50 4.67219
100 10 4.79431
50 20 5.20451
350 90 5.60648
250 90 16.91259
200 80 17.19205
150 70 19.7662
350 40 20.27518
450 50 21.26822
50 40 21.87275
300 30 23.34404
250 10 37.32591
500 40 38.05174
400 30 38.97979
100 70 40.59113
350 20 44.87209
450 30 46.33538
300 10 49.39694
150 90 49.83156
500 30 52.72432
400 20 53.79703
50 60 54.42573
100 80 59.77573
350 10 60.62056
450 20 62.30336
500 20 69.59203
400 10 70.79696
50 70 77.20242
450 10 80.39513
100 90 83.30284
500 10 88.53444
50 80 104.62686
50 90 136.95139