grdmath ../IN_OUTPUT/TEMP/surface_xyz_5km.grd ../IN_OUTPUT/TEMP/thick_xyz_5km.grd SUB = ../IN_OUTPUT/TEMP/socle_xyz_5km.grd
grd2xyz ../IN_OUTPUT/TEMP/socle_xyz_5km.grd > ../IN_OUTPUT/TEMP/socle_xyz_5km.txt