To access the Free charts from this page, just click on the symbol you wish to look at
:

For example GC:

On the top left of this chart you will find:
1) The commodity identified and the exchange,
2) The type of chart identification.
On the top right a legend identifies:
3) The 3 types of bars and the Open Interest line.
The 5 lines at the bottom of the chart provide the following information for the last 5 weeks of data:
4) the date corresponding to the end of the week of data (a Tuesday),
5) the number of  Large Speculators represented by the following data,
6) the number of contracts the Large Speculators have Long,
7) the number of contracts the Large Speculators have Short,
8) the percentage of contracts held by the Large Speculators that are Bullish,
9) the number of Commercials represented by the following data,
10) the number of contracts the Commercials have Long,
11) the number of contracts the Commercials have Short,
12) the percentage of contracts held by the Commercials that are Bullish,
13) the number of contracts the Small Speculators have Long,
14) the number of contracts the Small Speculators have Short,
15) the percentage of contracts held by the Small Speculators that are Bullish,
16) the number of open contracts (one of long or short).
The central portion of the chart has 3 bars for each week showing the Net (Long - Short) number of contracts for the 3 groups:
17) Large Speculators (blue),
18) Small speculators (yellow),
19) Commercials (red).
The scale on the left edge of the char applies to these bars.

The green scale on the right edge of the chart provide the scale for the total open interest which is the green line across the chart.

The priced charts are similar but plotting the price information for the same time period each week make the relationship between price and group of trades easier to track and understand.