Curve Line Type

Each selection represents a different neural network tracer.  Choose the one that works best with each curve line:

Solid

Optimal for the majority of solid curves.

Solid2

Try this option when curves are mostly vertical and Solid will not follow.

Light Solid

A little slower, but works great with intertwining solid/dashed curves and irregular or inconsistent solid curves. 

Dot/Dash

This option is optimal when the dots/dashes are distinguished between the grid lines

Solid BETA

This option works in many cases for both solid/dashed lines.  It is a nice additional option.

You may wish to experiment with the different line types for the curve you're tracing to see which one performs the best.