/span></span>
<span><span class="co">#&gt; Coefficients:</span></span>
<span><span class="co">#&gt;              elevation    slope</span></span>
<span><span class="co">#&gt; estimate    -1.3826286 1.571576</span></span>
<span><span class="co">#&gt; lower limit -2.2584635 1.224054</span></span>
<span><span class="co">#&gt; upper limit -0.5067936 2.017763</span></span>
<span><span class="co">#&gt; </span></span>
<span><span class="co">#&gt; H0 : variables uncorrelated</span></span>
<span><span class="co">#&g