The lines for the WMA indicator are shown at the bottom part of the Bookmap’s interface. As you can see, the picks for the green line (bids activity) generally correspond to the increasing price and the picks for the red line (asks activity) generally correspond to the decreasing price. However, there isn’t always such a strict correlation. One can use the information provided by the WMA indicator to better understand the order book, thus making more reliable decisions

The full WMA indicator’s description can be viewed here – https://docs.google.com/document/d/1f5eWuRmQr8XWauyMqTcJIFdcTltGTBiTnRpo7PobJng/edit?usp=sharing