ttps://rdrr.io/r/grDevices/adjustcolor.html" class="external-link">adjustcolor()</a></code>.</p></dd>


<dt id="arg-red-f">red.f<a class="anchor" aria-label="anchor" href="#arg-red-f"></a></dt>
<dd><p>Argument used if <code>col="natural"</code>, to adjust colors with
<code><a href="https://rdrr.io/r/grDevices/adjustcolor.html" class="external-link">adjustcolor()</a></code>.  Higher values of <code>red.f</code> cause red hues
to be emphasized (e.g. dry land).</p></dd>


<dt id="arg-green-f">green.f<a class="