this shows corn/crude oil relationship -Well that didn't work well did it?

Anyhow use your charting program (I believe any that displays work from barchart will work) and look at corn mar13. At the bottom in chart settings, 'compare to' enter clg13, select monthly from below.

From around mid Dec, oil has streaked above the value of corn.

OK I got a daily comparison but it doesn't go back as faar as the monthly did. I'm sure you can figure that out. Remember you are looking at ratios, not absolute numbers. Corn needs to get back to near Nov highs to track with oil