What is "this"? Do you have existing code? If so, how does it create the actual image? The ChartUtilities class has methods that allow you to pass in the image size you want to create.
hmm, will see how will that work, a bit more development to test it.
I guess if there is missig data then there should be breaked line for 'onion'on normal x/y chart ?
Will report how will that pop out.