In the graph, the MACD indicato shows a blue line that represents the difference between the 26-period moving average minus the14 periods, while the mustard line represents the signal line (moving average for 9 periods). According to this indicator, whenever the blue line crosses the mustard line from above a short position must be taken, and in contrast each time the blue line crosses the signal line from below, a long position must be taken. In this way, the histogram of the indicator takes on a value of zero when a trend change is generated in the graph, this reaction being in turn consistent with the taking of positions.