For time series plots using zoo I want the layout to be horizontal rectangles rather than squares. When I specify par(pin="5,2.5") an error is returned: Error in par(pin = "5,2.5") : graphical parameter "pin" has the wrong length In addition: Warning message: In par(pin = "5,2.5") : NAs introduced by coercion Is there a maximum length for the plot area? The pair (4,1.5) produces the same error. Rich