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SEP3D tools

There are several SEP3D header manipulation applications in SEPlb that qthead attempts to replace. Headermath allows the creation of keys based on mathematical expressions using constants and other key values. This includes the ability to rotate the coordinate system by entering a rotation matrix based on x and y values. Window_key subsamples the dataset based on ranges of values for different keys. Sort3d allows the user to overlay a regular grid on irregular key locations. Finally, the programs Stack3d and Infill3d create a regular dataset from an irregular volume using the grid created in Sort3d.