The first three bays of the nave are noticeably wider than the rest. The vault of the first is gone, but that of the next three remains, supported on massive corbels. The vaults of the next three bays collapsed in the 19th century.
The initial three sections of the nave have a wider design compared to the rest. The vault of the first bay is missing, but the next three retain their vault structure and are supported by substantial corbels.  The vaults of the subsequent three bays collapsed in the 19th century.