The source pano image is 8192 x 4096 pixels, decomposed into an ImagePyramid for display in a Google Earth PhotoOverlay using the Photoshop script. That means you can zoom in and enjoy the detail of the stone (except in the overexposed areas of course).
Unfortunately the implementation of spherical viewing isn't all it should be in 4.2beta, and the pano flips upside down when you stray too far from the initial heading. There also seems to be a bug which causes GE to crash if you launch a second instance of the same PhotoOverlay whilst still in viewing mode. Hopefully these issues will be cleared up before long.