See here for the meaning of "rather than" (conjunction): rather than - Wiktionary

Interested in Language
Indeed, every table of alues, every ''thou shalt" known to history or ethonology,
requires first a physiological investigation and interpretation,
rather than a psychological one; and every one of
them needs a critique on the part of medical sicience.
My question:
1) How to understand the phrase ''rather than" grammatically?
2)What‘s the phrase's meaning ?
Thanks!
See here for the meaning of "rather than" (conjunction): rather than - Wiktionary
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