This attribute specifies the plotting tolerance (or resolution)
to be used for the graphical output produced by a Plot. Smaller
values will result in smoother and more accurate curves being
drawn, but may slow down the plotting process. Conversely,
larger values may speed up the plotting process in cases where
high resolution is not required.
The Tol value should be given as a fraction of the minimum
dimension of the plotting area, and should lie in the range
from 1.0E-7 to 1.0. By default, a value of 0.001 is used.