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+Xgas, animated simulation of an ideal gas
+
+Xgas is a physical simulation of an ideal gas in a heated box.
+Gas molecules move around the box with velocities dependent on
+their temperature. A chamber consisting of two boxes contains
+the gas molecules collide with the walls, their temperature
+approarches that of the box.
+
+Use mouse button 1 to create molecules one at a time at
+the cursor position. Use mouse button 2 to create the
+maximum number of molecules at the cursor position.
+
+Usage: xgas [ -options ]
+
+Options:
+ -as Sets the autoStart resource.
+ -ts Sets the timeStepSize resource.
+ -d Sets the delay resource.
+ -rb Sets the randomBounce resource.
+ -eq Sets the equilibrium resource.
+ -mm Sets the maxMolecules resource.
+ -fg Sets the foreground.
+ -bg Sets the background.