Hi there,
Can anyone please suggest why it happens to be, when we decrease the value in Z axis , the line appears to be straight instead of being parallely inclined with points of intersection.
Hi Robert, can you show the graph that produces the lines?
Hi Robert
It’s difficult to identify the curve in question from the screen-dump you uploaded, I can have a look if you upload the .dyn and .xls (You’re reading from) 
Hi Jonathan,
As you can see in the first snip, the area in green is our final product; where the points mentioned in blue lines should match with blue points green line. The second snip mentions how these points are to be matched with arrows specified
Also in 3D view the level has been decreased to 740mm i.e. section view points are already placed in parallel with line, so that the final product( Snip-3) in green (left) should match with the blue (on right)
I’m sorry but I just can’t wrap my head around what it is you’re trying. But I did notice that you have points floating around in the domain (x,y) < (100,100), while the rest of your points are at (x,y) > (630.000, 630.000)
Below is the “points” in your excel at the domain < 100. 


