 The aisles are tall, with minimal height difference with the center nave, creating a space that suggests a single church-hall, more common in the first half of the 16th century.The interior is lit through large oculi, that open in the wall of the lateral nave of the side of the Epistle and in the apses.Originally, there were also some holes in the central nave, but these were covered when the roofs were raised around 1580.