Quarterly commodities; viewing longer charts

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Hi

I wonder if anyone can help me with this. I'm interested in trading things such as Pork Bellies, Grain etc over an extended period, but find that these have limited charting as the bets are opened and closed quarterly (currently viewing on IG Index's graphing software). Does anyone know how to obtain a graph where these quarterly periods are 'joined', to give longer amounts of data?
 
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