Gradient Circles and File Sizes

 From smallest to largest file size, also what is displayed by the circles to the left are: JPEG Low, GIF Restrictive, JPEG Medium, GIF 32 No Dither, GIF 32 Dithered, PNG 8-128 Dithered, JPEG High, GIF 64 No Dither, GIF 64 Dithered, GIF 128 No Dither, Gif 128 Dithered, and PNG 24. As a note, the GIF 64's, GIF 128's, and Gif 32 Dithered/ PNG 8-128 Dithered share the same file size in their respective pairs.