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/usr/share/dx/samples/scripts/Equalize is in dxsamples 4.4.0-3.

This file is owned by root:root, with mode 0o644.

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// Import the data field
electrondensity = Import("watermolecule");
electrondensity = Partition(electrondensity);

// Color and volume-render the original field. Most of the data values
// lie very close to zero, and the volume is essentially all blue.
colored = AutoColor(electrondensity);
camera = AutoCamera(colored,"off-diagonal");
Display(colored, camera);

// Equalize the data values to be more uniformly distributed between the
// minimum and maximum data values. Recolor, rerender and display.
equalized = Equalize(electrondensity,bins=1000);
colored = AutoColor(equalized);
camera = AutoCamera(colored,"off-diagonal");
Display(colored, camera);