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From: Michael Okuntsov <okuntsov.mikhail@yandex.ru>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Strange Mobius strip in rendering a cylinder with pm3d
Date: Tue, 28 Jun 2016 16:20:39 +0700
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28.06.2016 11:43, musiphil@bawi.org пишет:
> splot "data" using (3*cos($1)):(2*sin($1)):2:3 palette with pm3d notitle

I've tried to plot it in gnuplot 4.6, and it plots without this effect.
Try set hidden3d.