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<p>Gets the z-axis object. </p>
<dl class="section user"><dt>Syntax</dt><dd><div class="fragment"><div class="line"><span class="comment">class(plot_axis) function, pointer get_z_axis(class(plot_3d) this)</span></div>
</div><!-- fragment --></dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">this</td><td>The <a class="el" href="structfplot__core_1_1plot__3d.html" title=