ions.html#float" title="(in Python v3.11)"><em>float</em></a><em>, </em><em>optional</em>) – The position to place the slip plane within the system given as a
relative coordinate along the out-of-plane direction.  faultpos_rel
and faultpos_cart cannot both be given.  Default value is 0.5 if
faultpos_cart is also not given.</p></li>
<li><p><strong>faultpos_cart</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#float" title="(in Python v3.11)"><em>float</em></a><