Hi Andrzej, i have the prog a little bit changed. Just it should be run. I don't know, what's going on with only 1 subtile column and a width < 64. If this not worked, i change it, so that we have in this case 64 points. If you have -w 0.90 and --dlon=0.0266666666666664, than there are only 34 points. Frank