To draw a surface graph:
A B C D E F G 1 1 2 3 4 5 6 2 1 2 3 4 5 6 7 3 2 3 4 5 6 7 8 4 3 4 5 6 7 8 9 5 4 5 6 7 8 9 10 6 5 6 7 8 9 10 11 7 6 7 8 9 10 11 1
The X coordinates of each point are listed in the first row in range B1..G1. The Y coordinates are in the first column in the range A2..A7. The Z coordinates for each point are listed in the data block B2..G7. Thus, the Z coordinate 7 in cell C6 is paired with the X coordinate 2 in cell C1 and the Y coordinate 6 in cell A6. NExS always assumes the X coordinates of a selected block are along the upper row and the Y coordinates are along the leftmost column.
NExS allows one surface to be displayed per window, so only the ranges displayed in the dialog box for Data Set 1 affect the surface graph. You can also change Line Style and Segment Type of the lines on the surface graph. Marker type and Legend Text have no effect, since only one surface can be displayed at a time.
As an additional convenience, NExS does not force you to strictly order your data. For instance, if you swapped the contents of columns D and E in the example so that the X coordinates had the sequence 1,2,4,3,5,6 (the 4 and 3 are now out of order) then NExS would sort all the data before creating the surface graph.