This program creates a price series using all contracts. Each contract is plotted beginning 1 (or 20, depending on your selection) trading days before the previous contract expires until its own expiration. There is no shifting of the contracts.

1. Pick a commodity.

2. Select the "cutoff days." This is the number of days before the end of a contract that the "rollover" to the next contract occurs.

3. Select the chart type. The jpegs are faster; the applets are interactive (zooming in is possible and there are data popups).

4. Press "Get Chart". There's a lot of data to download, so be patient.

This is a limited set of commodities available to nonsubscribers. Subscribers can access data for over 40 commodities.