Overkill has a dimensional tolerance setting that might be of use but in order for lines to be considered within tolerance, they must be parallel. Many of your lines are not parallel and some of them are even ellipses. Here is a partial solution (though not recommended). 1)Eliminate the almost straight ellipses. 2)Select a window of what appears to be parallel lines and select autoconstrain (on parametric tab). Then delete the constraints. Then do overkill and check whatever ignore settings you can live with. Set the tolerance to something like 0.01 or 0.001 and then click OK.
Recommended approach to simplification(if this symbol will be used hundreds of times). 1)Add a layer with a different color and trace over your linework with single lines and arcs. Then delete the original objects and move the new objects to layer 0. Otherwise live with the slight problems as it will not likely affect any of your plots.
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