Xerox DocuTech 6100 Operator's Manual page 138

Technical information
7-22
Figure 7-1. Rotatable and non-rotatable sizes ("as loaded"
Sizes whose dimensions are located on the left of the curve or
on the line itself have a diagonal that is less than or equal to 18.0
inches (457 mm) and therefore can be rotated. Those sizes
whose dimensions are located to the right of the curve have
diagonals greater than 18.0 inches (457 mm) and therefore
cannot be rotated. Some common ISO sizes and US sizes are
shown on the graph as examples.
media sizes)
DocuTech 61xx Operator Guide