## S3 method for class 'gtable':
rbind(..., size = "max", z = NULL) ## S3 method for class 'gtable':
cbind(..., size = "max", z = NULL)
x and y)first, or last gtable, or
compute the min or max values. Defaults to
maxNULL, then the z values of obects within each
gtable will not be modified.