A name with file extension (if device is NULL) to be given to the
output file. Template variables such as @run (run number) and @plotfun
(plot function) can be used to automatically name files e.g.
file = '@run_@plotfun.pdf'.
dir
Directory under which the xpose plots will be saved. Template variables
such as @dir can be used to generate template names.
device
Graphical device to use. Can be either be a device function
(e.g. png), or one of 'eps', 'ps', 'tex' (pictex),
'pdf' (default), 'jpeg', 'tiff', 'png', 'bmp', 'svg' or 'wmf' (windows only).
width, height
Plot size in units.
units
Units of the plot size ('in', 'cm', or 'mm').
dpi
Plot resolution. Applies only to raster output types.
...
Additional arguments passed on to ggsave or graphics device.