R help - Jul 2012 - question about heatmap.2, controlling the visual heights of two dendrograms

Hi,
I have a question for gplots function heatmap.2.

In this function, is there any way to control/know the heights of two
dendrograms, such as how many pixels or how many percentage of the whole
image the dendrogram have?

I need to know the coordinates of northwest corner of real heatmap in the
whole image including two dendrograms.

Thanks for your help!

Tim

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