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Calculate the median values for a set of groups.
median takes the first blank space-separated column
values and the remainder as keys. It will then print
the median for each key. As a side effect median will
will print the result sorted by the keys.
Usage example:
$ cat <<EOF | median
+003 c
.001 a
-002 b
+001 c
-001 b
+002 c
EOF
.001 a
-001.5 b
+002 c
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