I asked because a book that has been available for a long time like Dune may have been published in different editions with different ASINs. And each edition may have been updated multiple times by the publisher. It's possible that the publisher failed to supply the xray data to Amazon for the latest update.
If you want to dig into it some more you can connect your Kindle to a PC or Mac and search for the .sdr folder associated with that book. There should be one or more files there with names starting with "XRAY".
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