Sum of volume in standard Depth of Market

Adding additional row of data to standard Depth of Market summarizing all the volume for buy/sell orders (separately).

This way you could take a quick look on the Depth of Market and have an idea how it is shaped without the need of analyzing all the volume amount for all the prices. There is a visualisation of that with bars, but values are relative and not summed up. The bar takes 100% width for the highest volume, but you don't have an idea how much that actually is until you read the volume amount itself. Assuming the view is updated several times a second, trying to sum it manually is a difficult task to do.