Note on PostScript
------------------

If the user selects **ps** as one of the formats, then please be aware that
it is recommended you first set the desired paper size.  With **ps**\ , GMT needs to
work with a fixed paper size since, unlike the **eps** format, there will be
no cropping to BoundingBox.  If no paper size is specified via :term:`PS_MEDIA`
then GMT will default to A4 and issue a warning; GMT is unable to determine if that
size is adequate for your plot but if the canvas width exceeds A4 paper width we will
switch page orientation to landscape. For all other formats the final dimension will
be determined automatically.