Thank you for your quick reply. I tried to upload the file but I can not...It is a .txt file, space delimited, containing the following data:
436083.51 4489939.09 28.52
436083.51 4489939.03 28.54
436083.51 4489938.97 28.56
436083.51 4489938.93 28.55
436083.51 4489938.88 28.56
436083.51 4489938.83 28.57
436083.51 4489938.77 28.58
436083.51 4489938.72 28.59
436083.51 4489938.66 28.60
436083.51 4489938.61 28.62
436083.51 4489938.56 28.63
436083.51 4489938.51 28.63
436083.51 4489938.44 28.65
436083.52 4489938.39 28.67
436083.52 4489938.33 28.69
436083.52 4489938.28 28.69
436083.52 4489938.23 28.69
436083.52 4489938.19 28.69
436083.52 4489938.14 28.69
436083.52 4489938.10 28.69
436083.52 4489938.05 28.69
436083.52 4489938.00 28.69
436083.52 4489937.95 28.69
436083.52 4489937.90 28.69