[zbzfvyze] Andromeda

Hubble, Spitzer, et al. have produced large photographs of objects in the night sky. But the biggest and best target should be the Andromeda galaxy, which will continue to yield interesting detail no matter how big (it's a galaxy! compared to other pictures of local nebulae). What is the largest picture (in megapixels or gigapixels) taken of Andromeda? Challenge: take a larger one.