Let say I would like to compare the seasonal trend of yearly Gold daily charts. I want the chart software to display all past 3 years (2006, 2007, 2008) daily charts Jan - Dec on the same screen. I will have let say green chart for 2006 gold daily, blue chart for 2007 gold daily and red chart for 2008 gold daily. Is there any charting software that can do this? Or Excel is the one?