>
> The lines are caused by the fact that the root solver will only run at
most
> 50 iterations before giving up and saying that it's close enough.
Normally,
> 50 is more than enough, but in some situations, such as what you've got
> here, it isn't.  If you zoom in on those lines, you'll find that the
surface
> there is significantly above or below the surface for the rest of the
> bottle.

Then wouldn't it be wise to allow this value to be changed?

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