Comparisons
You can add up to three other symbols for price comparison directly on the chart. To create a Comparison chart, click the "Compare" button.
When a symbol's price scale differs from the underlying chart, you may want to check the "Left Scale" option so the price data can be displayed in an easier-to-read format (comparing corn and the S&P 500 for example).
The compared symbol’s plot type can be customized using Plot Type drop down menu in the comparison menu.
You can opt to compare the symbols based on actual values, net change and percent change using the “compare as” drop down menu.