This is picture taken from 'Ignition' book by John D Clarke.
I am bewildered after seeing picture that I can't find wrong in this picture. I guess this is related to the structure of mach diamonds.
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I think there's a mix-up in the labeling of the photo.
Here's the photo and caption from a copy of "Ignition" that I just downloaded:
Here's the photo and caption from the next page:
Seen together, those two photos and captions make sense.
Somebody mixed up the images and the captions in the copy you are reading.