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Figure 6. Figures 5, 6. (5) High-resolution transaxial CT scan of a Stradivarius violin shows an air gap (white arrow) between the rib and an internal corner block. Note the two air-glue interfaces between the inner surface of the rib and the inner corner block (black arrows). Arrowheads indicate the back plate. (6) High-resolution transaxial CT scan of the front plate of a very old and valuable Stradivarius violin shows mild, asymmetric plastic deformity of the front plate and tilting deformity of the ebony fingerboard.