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An output grid created by PROJECTGRID with the NINE or SEVENTEEN options can be substantially larger than the input grid.
This is a known problem with the internal grid compression scheme for these outputs.
This problem doesn't occur with PROJECT and PROJECTGRID with the FULL option.
Resample the output grid to the same cell size. This reduces the size of the final result.
Grid: grd_project = projectgrid (grd_source, prj_file.prj, #, nine)
Grid: setwindow grd_project
Grid: setcell grd_project
Grid: grd_resamp = resample (grd_project)