I'm trying to export certain graphics from an Illustrator file. I'm selecting the object, fitting the artboard to the selected artwork, and saving for web & devices, PNG-24 format. When I look at the art in Illustrator, it is properly capturing the artwork, but when I look at the outputted file, I am losing a few pixels on the right and bottom sides of the image. Take the included image as an example, you can see it's not a perfect circle-- the top and left sides look correct, but the right and bottom sides come to too much of a flat part. Nothing is obscuring the art in Illustrator, and I can't figure out what is causing this. Any help is appreciated! Thanks.