Fri, 10 Nov 2006 19:04:18 +0100 urbanc deleted all uses of sign_of as it's now the identity function
Fri, 10 Nov 2006 10:42:28 +0100 wenzelm tuned;
(0) -10000 -3000 -1000 -300 -100 -30 -10 -2 +2 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip