// Import the data
electrondensity = Import("watermolecule");
    // Partition the data
electrondensity = Partition(electrondensity);
    // Compute the gradient
gradientdensity = Gradient(electrondensity);
    // Compute the magnitude of the gradient
maggradient = Compute("mag($0)",gradientdensity);
    // Create an isosurface at a value of 0.3
isosurface = Isosurface(electrondensity,0.3);
    // Map the magnitude of the gradient onto the isosurface
mappediso = Map(isosurface,maggradient);
    // Create a camera
camera = AutoCamera(isosurface);
    // Remove all points except those between values 0 and 1.5
included = Include(mappediso,0,1.5);
    // Display
Display(included,camera);