default a4-format for printing, how ?

I want to print some graphics by g25run in batch mode. Unfortunately this seem sto use the
letter format as default. I couldn't find any way to reset this parameter to A4 noninteractively.
I couldn't find anything in the docs either. Anybody out there, who can help ? I'm using dev2k v 1.3.2 (graphics v 2.5), do I have to upgrade ?
Thanx for any help, I hope, I haven't missed sth. obvious,

Ansgar

--
 Ansgar Seiter                   Group Prof. Ch. Schlier
 Department of Physics
 University of Freiburg          Phone:  +49 761 203-5730
 Hermann-Herder-Str. 3           FAX:    +49 761 203-5873
 D-79104 Freiburg i.Br           E-Mail:
ansgar.seiter_at_physik.uni-freiburg.de
 Germany