The Spread Charts module allows you to plot the price of one series of prices below the other and run several types of comparisions between the closing values of each bar.

Spreads can be used to work out the strength of trends between different mediums in the same complex such as grains or currencies. They can also be used to evaluate the sentiment between futures and basis by studying the changes in premium and discount.

There is a lot of spread trading in the grains markets and these are of particular interest to me that is why I added this module to the CycleTrader arsenal.