How to select only curves parallel to the vector field in iso-curves component (Millipede)

Hi all,
after using the reparameterization component for a given mesh and a given vector field, I would like to select just the iso-curves parallel to the vector field and not the orthogonal ones. The problem is that, apparently, the curves are shuffled.

Could you please help me?

Thank you

file.gh (37.1 KB)