Import Waterfall.dat from \Samples\Graphing folder
Highlight all data in book1,then make a Contour profile plot
In VLine tab,set Scale : 0, X value : 1173.65, click Go to profile data button
Compared with source data in book1,
==> Z value is 660.29, 654.5, 661.21....,which should be 641.36, 658.99, 670.53 ,687.16...