In order to get an inverted axis for xy plots use a minus sign in the -J option (scale/length of axis), e.g. -Jx-0.5/-1

Subversion is a revision control software like CVS. It allows you to keep track of changes you made to any project, either software projects, data projects or your thesis.

Good tutorial to set up svn on Mac OS X:
http://www.distracto.net
Subversion home page:
http://subversion.tigris.org
Pre-compiled binaries for Mac OS X on Martin Bott's homepage:
http://www.codingmonkeys.net/mbo