Blue line in the TA means positive growth in prices of a security. A reading higher than 1 is somehow an indication of prices making higher highs, but in the meantime watch out for a decline in its readings, which may imply the uptrend is fading or reversing. It is just the opposite for the red line, which means negative growth in prices.
Traders can stick to either one lines, or both of them, and look for crossover signals. To make this more convenient, crossing alert is already set up. Hope you will find it helpful. Appreciate likes and comments!