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silly font problem

Hello !

We have a silly problem with Idl fonts: After loading a specific font with
device, set_font='...', we cannot go back to the default font because

a) device, get_current_font=font  reports font='' for the default, and trying
b) device, set_font=''            results in an error. 

How can we switch back ? Does anybody know what is the default font ?
We tried to guess it with xlsfonts and xfontsel, but no success. We also
had a look into the Idl resource file, but also no indication.
Please help !
Dr. Udo Grabowski                           email: udo.grabowski@imk.fzk.de
Institut f. Meteorologie und Klimaforschung II, Forschungszentrum Karslruhe
Postfach 3640, D-76021 Karlsruhe, Germany           Tel: (+49) 7247 82-6026
http://www.fzk.de/imk/imk2/ame/grabowski/           Fax:         "    -6141