Wed, 12 Jan 2011 15:09:26 +0100 wenzelm eliminated obsolete print_sign_exn_unit;
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -1 +1 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip