## S3 method for class 'gtable'
rbind(..., size = "max", z = NULL)
## S3 method for class 'gtable'
cbind(..., size = "max", z = NULL)
Arguments
...
gtables to combine (x and y)
size
How should the widths (for rbind) and the heights (for cbind)
be combined across the gtables: take values from first,
or last gtable, or compute the min or max values.
Defaults to max.
z
A numeric vector indicating the relative z values of each gtable.
The z values of each object in the resulting gtable will be modified
to fit this order. If NULL, then the z values of obects within
each gtable will not be modified.
providing 
.