pan class="r-pr">#&gt;</span>       X1    X2    X3</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> X1 1.000 0.499 0.749</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> X2 0.499 1.000 0.250</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> X3 0.749 0.250 1.000</span>
<span class="r-in"><span></span></span>
</code></pre></div>
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