PAC chart
Price Activity charts are a type of stock chart used in the Technical Analysis of stocks.
PAC charts are unique in the way they represent "volume". Traditional stock charts display volume data as a histogram on the bottom of stock charts. PAC charts, on the other hand, track and compound estimated volume data at each price level and color-code this information directly in the stock chart.
This approach adds an order of magnitude of information to the chart, as volume is charted in 2-D instead of 1-D. The "infrared" palette of coloring provides readers with an intuitive way of detecting significant volume changes.
