[GRASS-user] null values

[goldneaa at onid.orst.edu]

Lets say I have a map with a range of -20, and 20.  I am able to  
create a legend that only shows -10,10.  But I want my map to only  
show values from -10,10.  Is there a way to make the areas that are  
above 10, or below -10 show up as white or null values on the display  
map.  I have been playing around with val. list in d.rast.  But I have  
not had much sucess in creating maps that take out my max and min  
outliers.  Any suggestions?
Aaron