US Dollar Index w/IB and Excel

I want to create a US Dollar index in Excel, using IB quotes. Has anyone done this?

I want it's quotes to be equivelent to those of the NYBOT DX.

Interactive Brokers has feeds for all the currencies in the DX basket, through IDEAL Forex and through CME/Globex futures.

I'm not sure which quotes I should use, and I'm not sure exactly to caclulate it.

Is there a thread on this subject somewhere already?
 
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