From that site: "The raw output from the digital scan of a 70mm Hasselblad frame, is a huge 1.3GB, 16-bit TIFF file. At approximately 11,000 pixels square, a single image would require a 12-foot x 12-foot computer monitor to display the whole image at standard resolution. "

The Flikr images must be jpg conversions of the original TIFFs, certainly in an attempt to reduce file sizes. I'm not sure where the 11,000 comes from. The JPGs are 4400x4600. Perhaps the original TIFFs were 11,000x11,000 pix.