[GRASS-dev] r.sun artifacts

[Sergio Gollino]

Hi, this is my first post and I hope someone could help me.
I'm using r.sun for computing a solarmap of the alpine arch in Friuli
Venezia Giulia (IT).
I'm using this command:

r.sun -s elevin=dem_40_fvg_wgs84 aspin=asp_fvg_wgs84 slopein=slo_fvg_wgs84
lin=1.5 alb=0.2 horizonstep=10 beam_rad=irr_fvg1   insol_time=ins_fvg1  
diff_rad=diffuse_irr__fvg1   refl_rad=ground_refl_fvg1  
glob_rad=total_irr_fvg1   day=1   step=0.25 dist=1.0 numpartitions=1
--overwrite

But the resultant map have a lot of artifacts (lines of pixels with wrong
values, see the attachment)
http://osgeo-org.1803224.n2.nabble.com/file/n6917645/r.sun.jpg 

I've tried to delete "aspin" and "slopein" parameters and i've changed
"step" and "dist" with no results. 
What can i do for remove this artifacts? Except for this problem the map is
good.

I'm using Grass6.4.1. My OS is W7 64bit.

thx

Sergio

p.s. sorry for my english

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