The top left of the image represents the current BID price ($151.07) and the top right of the image represents the current ASK price ($151.08). At the $151.07 bid price point, there are 300 shares available (200 by the ARCA Market Maker and 100 by the DRCTEDGE). At the $151.08 ask price point, there are 3900 shares available (2800 by the ARCA Market Maker and 1100 by the BATS Market Maker). This is typically represented in quote form as: $151.07 X 300 by $151.08 X 3900).