This attribute specifies the plotting tolerance (or resolution) to
be used for curves. Smaller values will result in smoother and more
accurate curves being drawn (particularly in the presence of
discontinuities in the mapping between graphics co-ordinates and
physical co-ordinates), 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
7 to 1.0. By default, a value of 0.001 is used.