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<P><FONT SIZE=2>hi<BR>
i had similar problem couple months ago<BR>
use this link, maybe it will be useful<BR>
<A HREF="http://grass.itc.it/pipermail/grassuser/2006-April/033557.html">http://grass.itc.it/pipermail/grassuser/2006-April/033557.html</A><BR>
regards<BR>
<BR>
Maciej Tomaszczyk<BR>
Polish Geological Institute<BR>
Geological Mapping Department<BR>
<BR>
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