Reset the par to R's defaults.
reset_par()Some of par's settings are readonly. These are obviously not reset.
Settings stored in par are device-dependent. In practice,
most settings in par are initially the same accross devices. Exceptions
we noted are:
bg: background color
fin: figure region dimensions
mai: margin size (inches)
pin: current plot dimensions (inches)
plt: coordinates of the plot region as fractions of the current figure region
ps: point size of text (but not symbos)
Consequently, these options are currently not reset by calling reset_par()