Pre-existing flight line positional information may be imported using the Geophysics > Calculate Anomalies >XYZ Point Data > Import From File menu item, which will open any plain ASCII column format data file. You will have the opportunity to specify which columns refer to X, Y and Z. Once the calculations have been completed two extra columns for TMI and Gravity will be appended to a copy of the import file. The area of the window below the Parameter Mapping section shows the first few lines of the file to aid in selecting the proper X,Y,Z columns.

Any input row starting with a number will be considered to be data, and any other row will be considered to be a comment.