<li><strong>Calculate Tree or PCA ...</strong> <br> <em>Opens the
<a href="../calculations/calculations.html">calculations dialog</a> for
for calculating <a href="../calculations/tree.html">trees</a> or
- <a href="../calculations/pca.html">principle component analysis
+ <a href="../calculations/pca.html">principal component analysis
plots</a> on the alignment or the currently selected
region.
</em><br>