nodes in vector output from p.map

[Bret J. Ruby, GBL, 855-0522]

I've been using p.map to produce postscript output of a vector
map patched together from USGS DLG hydrography coverages
(ppmtopgm paint.ppm|pgmtops>outfile).
The problem is that stream origins and terminations are 
marked by rather prominent nodes on the output, producing a 
busy-looking map. Is there any way to suppress these on the output?

Thanks in advance,

bjr
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Bret James Ruby			         Voice:        (812) 855-9544
Glenn A. Black Laboratory of Archaeology   Fax:        (812) 855-1864
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