<p>If omega0 = 0 the potential term has a minimum for the planar
structure. Otherwise it has two minima at +/- omega0, with a barrier
in between.</p>
<p>See <a class="reference internal" href="#umbrella-mayo"><span class="std std-ref">(Mayo)</span></a> for a description of the DREIDING force field.</p>
<p>The following coefficients must be defined for each improper type via
the <a class="reference internal" href="improper_coeff.html"><span class="doc">improper_coeff</span></a> command as in the example
above, or in the data file or restart files read by the
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