| plotViewport {grid} | R Documentation | 
This is a convenience function for producing a viewport with the common S-style plot layout – i.e., a central plot region surrounded by margins given in terms of a number of lines of text.
plotViewport(margins=c(5.1, 4.1, 4.1, 2.1), ...)
margins | 
  A numeric vector interpreted in the same way
as   | 
... | 
  All other arguments will be passed to a call to
the   | 
A grid viewport object.
Paul Murrell
viewport and
dataViewport.