/data/StereoPairs/world/Etopo2Left10.ppm /data/StereoPairs/world/Etopo2Right.ppm 2 -3
/data/StereoPairs/world/Etopo2Left20.ppm /data/StereoPairs/world/Etopo2Right.ppm 6 -3
/data/StereoPairs/world/Etopo2Left40.ppm /data/StereoPairs/world/Etopo2Right.ppm 12 -3