*Jim Trivially: did you do "g.region rast=na_dem_sub_20" before raster computations? And r.mapcalc expression is without any quotes like r.mapcalc "na_dem_sub_20 = na_dem_input - 20" or r.mapcalc 'na_dem_sub_20 = na_dem_input - 20'
------------------------------------ Alexander
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