In the HDTV setup menu there are 3 choices of Aspect Ratio, 16X9 is self explanitory, but what are the 4X3 #1 and 4x3 #2. I don't see any difference between the 2 on my set. I have a 32" Panasonic TAU. I use the component (YPbPr) cable to my set. Any info would be appreciated greatly. Thanks