Question: How to extract only horizontal contours of an isotrimmed brep?

I have a brep that I’ve been able to subdivide into a grid that follows the surface of the object, but I only want to draw the horizontal lines in the grid. I have very limited grasshopper knowledge so any help would be greatly appreciated! (attached is a version of this file as well as a screenshot of what I generally want the definition to do) (24.3 KB) (28.7 KB)

use the isocurve with your uv values
really just u or v alone, the other dimension can be all 0s