The a/c in the front, 17 seems to have kidney bean shape intakes that are vertical. Where the a/c to the left, 63, seems to have the same shape but sitting horizontally.
Photo © Anthony Osborne
Other pictures of 63 appears to show that too.
Photo © Tim Wagenknecht
Photo © Jerry Search
Anyone else notice that? Anyone know what is up with the difference. Some experiment by NASA perhaps?