 <code>log="y"</code>. <br>
numeric, with points at which tick-marks will try to be drawn in the Y axis, in addition to the defaults computed by R. See the <code>at</code> argument in <code><a href="https://rdrr.io/r/graphics/zAxis.html" class="external-link">Axis</a></code>.</p></dd>

  <dt>xat</dt>
<dd><p>Only used when <code>log="x"</code>. <br>
numeric, with points at which tick-marks will try to be drawn in the x axis, in addition to the defaults computed by R. See the <code>at</code> argument in <code