Default background color for the plot (defaults to "white").
fonts
Named list of font names to be aliased with
fonts installed on your system. If unspecified, the R default
families sans, serif, mono and symbol
are aliased to the family returned by match_family().
pointsize
default point size.
editable
should vector graphics elements (points, text, etc.) be editable.
id
specifies a unique identifier (integer) within the slide
that will contain the DrawingML instructions.
last_rel_id
specifies the last unique identifier (integer)
within relationship file that will be used to reference embedded
raster images if any.
raster_prefix
string value used as prefix for png
files produced when raster objects are printed on the
graphical device.
standalone
produce a standalone drawingml file? If FALSE, omits
xml header and namespaces.