Exact table heigt in InDesign

I’m working on a small InDesign script, where I need to define the height of a table.
It’s a simple script where I make an selection of the cells I need to change, and then run the script.

This is what I got:

tell application "Adobe InDesign CS3"
	set myDoc to active document
	tell myDoc
		tell selection
			set the height to "6"
		end tell
	end tell
end tell

The height is set to 6, but my problem is that the heigt is set to “Minimum”, and I need it to be “Exactly”…

Any suggestions?