Here on the left you can see the last straight bay of the chevet with its characteristic three-oculi aisle window done by Thomas de Cormont and to the right the crown of radiating chapels also done by Master Thomas. Everything above the aisle roof is the work of Master Renaud: note how the buttress uprights have been reduced in mass. The elevation shows the older arrangement of aisle roofs in the choir with double-sloped surfaces intended to allow light to penetrate to the glazed triforium.