This chart shows the average times it took to broil hamburger patties in the oven. The quicker times of the burgers across the bottom show that the broiler is hotter over this region, which could result in uneven cooking.
The pictures on the left show biscuits we baked at the same time on different racks. The biscuits in the top left picture baked on a higher rake. The pictures on the right are color representations of the brownness of the biscuits. The biscuits located toward the front of the oven browned more than the other biscuits.