-and @subcmd{MAXIMUM} keywords can set an explicit range. The number of
-bins are 2IQR(x)n^-1/3 according to the Freedman-Diaconis rule. (Note that
-@cmd{EXAMINE} uses a different algorithm to determine bin sizes.)
+and @subcmd{MAXIMUM} keywords can set an explicit range.
+@footnote{The number of
+bins is chosen according to the Freedman-Diaconis rule:
+@math{2 \times IQR(x)n^{-1/3}}, where @math{IQR(x)} is the interquartile range of @math{x}
+and @math{n} is the number of samples. Note that
+@cmd{EXAMINE} uses a different algorithm to determine bin sizes.}