Pair trader: A new indicator

I figured I'd post this.
It's an indicator that plots the spread between two selectable instruments and also each individual instrument's line chart, with a colored fill to make it more clear visually when trading ratios.
In cointegrated pairs like audcad, you can trade the range extremes, and buy the laggard/sell the leader when overbought/sold conditions are met + distance from the 66/253 EMAs, as outlined in my AUDCAD post. (see related ideas)
Hope you find it useful!
Cheers,
Ivan.