UV-CDAT/uvcdat — pull request #666 by arulalant (2014-09-17 12:22:50+00:00)
Title: fixed issue #665 to avoid add_string multiple times.

Fixed issue #665 .
Look at the attached sample plot after fixed this issue
Thanks.

![xmgrace_string_bug_fixed](https://cloud.githubusercontent.com/assets/1246493/4303348/3f11619c-3e65-11e4-8b74-577405369b41.png)
(screenshot).