According to the selected paper norm one of these paper formats can be selected for the desired paper size:
A4, A3, A2, A1 and A0 formats for the ISO norm,
A, B, C, D and E formats for the ANSI and ARCH norms.
Note that some plotter types do not support internally all the paper formats. However, if you select a user defined Paper Set, the accessibility of each format is defined by this paper set. The unavailable paper formats are disabled.