This is driving me nuts. After I rtfm, Googled I still can't find an answer to a simple basic question. How do I compare side-by-side the original and the modified image in Aperture? I know that I can toggle with the space bar the 'm' key, and compare different images easily, but how to see side by side. I'm undecided between LR and Aperture and in LR this is easy - there is even an icon for it. But I cannot find out anywhere how to do it in Aperture.