Here's a screen shot of when I did the &a command. It went through a bit of glitches at the start you can see on the left of the plot and then pretty much straightened out. Even the green line has stabalized a lot. http://s251.photobucket.com/user/DogTi/media/time/20139-82237_zps85bd9fe7.jpg.html?sort=3&o=0