The 42-line Bible was printed on the size of paper known as 'Royal'. A full sheet of Royal paper measures 42 x 60 centimetres and a single untrimmed folio leaf measures 42 x 30 cm. There have been attempts to claim that the book was printed on larger paper measuring 44.5 x 30.7 cm, but this assertion is contradicted by the dimensions of existing copies. For example, the leaves of the copy in the Bodleian Library, Oxford, measure 40 × 28.6 cm. This is typical of other folio Bibles printed on Royal paper in the fifteenth century. Most fifteenth-century printing papers have a width-to-height ratio of 1:1.4 (e.g. 30:42 cm) which is mathematically a ratio of 1 to the square root of 2. Man suggests that this ratio was chosen to match the so-called Golden Ratio of 1:1.6; in fact the ratios are not at all similar (a difference of about 12 per cent). The ratio of 1:1.4 was a long established one for medieval paper sizes.