This illustration shows a line chart. It contains three lines painted yellow, blue, and green. The title of the chart says: "Stock Monitoring, 2010." The horizontal axis of the chart contains month captions "Jan" through "Dec." The vertical axis of the chart contains the following number values: 0, 10, 20, 30, 40, 50, and 60. The chart legend underneath the plotted data indicates that the yellow color corresponds to Portfolio 1, green to Portfolio 2, and blue to Portfolio 3.