Getting Facebook Image using graph api - bigger image than picture.type(large)

Im requesting the users image like so:

FBRequestConnection startWithGraphPath:@"me" parameters:@{@"fields":@"first_name, last_name, picture.type(large), email, gender, birthday, age_range"} HTTPMethod:@"GET" completionHandler:^(FBRequestConnection *connection, id result, NSError *error)

But the large image is still quite small, is there a way to request a larger image, or even better, and xlarge image. It was a shot in the dark but i tried picture.type(xlarge) but it caused an error.