3. Choose states at k=0 at the lowest and second lowest curves. What is the difference? 4. Choose states at the end of the Brillouin zone at the lowest and second lowest curves. What is the difference? 5. Set energy scale to smaller values, so on the top figure you can see many bands above the barrier. Set the barrier width approximately 1/31/4 of the period. Choosing the states on the top figure, compare states with energy below the barrier and well above