The width (number of characters) of the output.
‘data’ means that it will match the length of the data.
‘screen’ means that it will be scaled to match the
width of the screen. ‘auto’ means ‘data’
if the length of the data is not longer than the screen width,
and ‘screen’ otherwise.
common_scale
Whether to plot all rows on a common scale.
If FALSE, then all rows will have their own scales.
...
Passed to spark.default. E.g. it can be
used to mark the minimum and/or maximum values.