Yep, you just beat me to it. Background is about right for a good mid setting.
M J just popped in before my post...will have to give that more thought.
The link did get my attention. It just doesn't look 'right'.
There is another vein near the first of the small letters. Same angle.
Oh, BTW, would the veins drop sharply during rotation? this rings a very distant bell, but I wouldn't have thought it would have been anything like that angle. The one near the B of Boeing does seem to show a shadow as well.