rename x1.dem terra1.dem
rename x2.dem terra2.dem
demtool -pterra2 terra1.dem
rename x3.dem terra3.dem
demtool -pterra3 terra2.dem
rename x4.dem terra4.dem
demtool -pterra4 terra3.dem
rename x5.dem terra5.dem
demtool -pterra5 terra4.dem
rename x6.dem terra6.dem
demtool -pterra6 terra5.dem
