The height and color of the cylinders are used to designate the amounts of model grid point rainfall.
(The height and color of the cylinders; are used; to designate the amounts of model grid point rainfall) (The height and color of the cylinders; to designate; the amounts of model grid point rainfall)
The height and color of the cylinders The height and color of the cylinders
are used to designate
to designate the amounts of model grid point rainfall
the amounts of model grid point rainfall