Wed, 17 Mar 1999 16:33:00 +0100 wenzelm qualify Theory.sign_of etc.;
Wed, 17 Mar 1999 16:32:38 +0100 wenzelm fixed msg;
Wed, 17 Mar 1999 15:43:04 +0100 wenzelm tuned msg;
(0) -3000 -1000 -300 -100 -30 -10 -3 +3 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip