+ The `-a' option controls what total is accumulated down the
+ right hand side of the summaries:
+
+ none No running total down the right hand side.
+
+ distance Accumulate distance, in lightyears.
+
+ weight Accumulate the shortest-path weight function.
+
+ Beneath the path is printed a total for distance and weight if
+ these are interesting and not already displayed. The weight for
+ `hops' and `fuel' are simply the hop count and distance in
+ lightyears respectively; the other weight functions use
+ appropriate square-law functions.
+