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DEM viewer can be run whenever by clicking on Utilities > DEM viewer in the menu bar of 3DF Zephyr, and it can be exploited to: load DEM files (even those not related to the project you are working on) by clicking on File > Open; place contour lines on DEM if they have been previously generated in 3DF Zephyr, by clicking on View > Show Contour Lines; export DEM as a image format (.png, .jpg, .bmp); Users are even allowed to load the orthophoto as a further layer inside DEM viewer by clicking on File > Load orthophoto. Here is an example of DEM and orthophoto mixed together inside DEM viewer:
