// Import the data
electrondensity = Import("watermolecule");
   // Partition the data
electrondensity = Partition(electrondensity);
   // Create a camera
camera = AutoCamera(electrondensity,width=4);
   // Take a slab in the z dimension (dimension=2) at position 10. By default,
   // the thickness is 0
plane = Slab(electrondensity, 2, 10);
   // Color the plane
plane = AutoColor(plane,min=electrondensity);
   // Create an image and display it
image = Render(plane,camera);
Display(image);

   // Mark the "colors" component of the image as the "data". Now Compute
   // can operate on the "colors"
markedcolors = Mark(image,"colors");
   // Compute the negative of the colors
negative = Compute("[1.0, 1.0, 1.0] - $0", markedcolors);
   // The Unmark module returns the modified colors to the "colors" component
newimage = Unmark(negative,"colors"); 
   // Display the result
Display(newimage);