Rani - 2020-11-10

Hello,
Wrote a 3D function data points to table and plotted contours.
Get horizontal grid like lines or points along with the contours.
Have attached an image of it.

splot the function to a table contour.dat
Tried
plot 'table-contour.txt' using 1:2:3 with lines
and via stats command and plot each set of 2D data.
both give the horizontal lines. How to remove them?
thanks,
Rani