Page Layout
1  | pagelayout(dtype = "rgraphics", margins = NULL, pg.dim = NULL)
 | 
dtype | 
 Device type, currently available "rgraphics", "portrait", "landscape"  | 
margins | 
 A numerical vector of the form c(bottom, left, top, right) which gives the margin size specified in inches.  | 
pg.dim | 
 If custom page dimensions define a vector of c(width, height) units  | 
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