This illustration shows a line chart with three series of data. The chart has the following title: Stock Monitoring, 2010. The vertical axis shows numbers from 0 to 60 with the interval 5. The horizontal axis contains the captions corresponding to months from January to December. The chart legend indicates that the yellow line corresponds to Portfolio 1, the green line to Portfolio 2, and the blue line to Portfolio 3. However, the actual line colors are red for Portfolio 1, yellow for Portfolio 2, and violet for Portfolio 3.