The stems are in the middle, the leaves to the left are for the 1998 data, and the leaves to the right are for the 2000 data. Notice that although the symmetry is not perfect (for instance, the bar ju...The stems are in the middle, the leaves to the left are for the 1998 data, and the leaves to the right are for the 2000 data. Notice that although the symmetry is not perfect (for instance, the bar just to the right of the center is taller than the one just to the left), the two sides are roughly the same shape.