Example input section:
c ___ ___ comment ___DEMASSIST___ c DAC_IN_DEM final_wanaF2835.dem DAC_IN_FORMAT r4 DAC_IN_SIZE 3601 3601 DAC_IN_DELTA 0.000833333 0.000833333 DAC_IN_UL 40 27 // the center cn of UL corner p$ DAC_IN_NODATA -32768 DAC_OUT_DEM dem_dac.raw c DAC_OUT_DEMI demi_dac.raw c DAC_OUT_DEM_LP demLP_dac.raw