Thu, 07 Aug 2008 13:44:42 +0200 wenzelm advance: single argument (again);
Thu, 07 Aug 2008 13:44:36 +0200 wenzelm Symbols with explicit position information.
(0) -10000 -3000 -1000 -300 -100 -30 -10 -2 +2 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip