What is the grey indicator (between bids and ask) showing?
I'd like to know this as well. Looks like it's some sort of average?
It's the average price of orderbook.
It's a series of points
average price of 1 BTC ask, 1 BTC bid
average price of 1.1 BTC ask, 1.1 BTC bid
average price of 2 BTC asks, 2 BTC bids
and so on.
I'm working on display the numeric and label of those 3 lines, It would be some helpful.