Is there an easy way to control smoothness of the contour lines?

In the plot I am working on due to the undersampling the contour
lines I am getting are jugged, but it is clear "by eye" these should
be basically straight lines.

In maps package I found smooth.map function, but maybe there is a more
generic way
of accomplishing the same thing.

Ideally there would be an option to control smoothness of the contour
lines
in contourplot(), or levelplot(), but I cannot find a way to do it.

Best regards,

Ryszard Czerminski
AstraZeneca Pharmaceuticals LP
35 Gatehouse Drive
Waltham, MA 02451
USA
781-839-4304
ryszard.czerminski@astrazeneca.com


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