// Import the data
electrondensity = Import("watermolecule");
    // Partition the data
electrondensity = Partition(electrondensity);
    // Compute the gradient
gradient = Gradient(electrondensity);
    // Create a camera
camera = AutoCamera(electrondensity,"off-front");
    // Make about 10 samples
starts = Sample(electrondensity, 10);
    // Compute the divergence and curl
div,curl = DivCurl(gradient);
    // Create streamlines using the samples as starting points
    // Use the curl field to make the tubes twist 
lines = Streamline(gradient, starts,curl=curl);
    // Map the original field onto the lines
streamlinesmapped = Map(lines,electrondensity);
    // Color the lines
colored = AutoColor(streamlinesmapped);
    // Turn the colored lines into colored tubes, with a diameter of 0.4
    // in world coordinates, and three sides
tubes = Tube(colored,diameter=0.4,ngon=3);
Display(tubes,camera);