Note: With long simulations, the graphs contained too many points which induced very slow update of the display when the user was switching graphs or scrolling up and down. A new class checks for the significance of the points to be displayed and hence only displays the significant ones, resulting in much faster drawing. Updated to the latest versions of JDK (1.5.0_11), JFreechart (1.0.3) and JCommon (1.0.8)