set papersize ( size | <height>,<width> )
The papersize option sets the size of output produced by the postscript terminal. This can take the form of either a recognised paper size name – a list of these is given below – or a (height, width) pair of values, both measured in millimetres. For example:
set papersize a4 set papersize letter set papersize 200,100
A list of recognised papersizes can be found in Figure 3.1.