+ CHANGES IN APE VERSION 2.3-4
+
+
+NEW FEATURES
+
+ o base.freq() has a new option 'freq' to return the counts; the
+ default is still to return the proportions.
+
+
+BUG FIXES
+
+ o seg.sites() did not handle ambiguous nucleotides correctly: they are
+ now ignored.
+
+
CHANGES IN APE VERSION 2.3-3