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/usr/share/dx/samples/scripts/Stack is in dxsamples 4.4.0-1.

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// Import the electron density data
electrondensity = Import("watermolecule");

// Color the volume
colored = AutoColor(electrondensity);

// Slice the data in the z dimension
slices = Slice(colored,2);

// Stack the data in the x dimension and display
stacked = Stack(slices,0);
camera = AutoCamera(stacked,"off-front",width=7);
Display(stacked,camera);