It's a formal usage and the position may look strange. To me,it hasa rhetoricalsound, but the movement doesn't affect the meaning,IMO. It's perfectly possible to have preposition + which,though most would shove the reposition at the end. Presumably, 'here' serves to focus the reader on the text in hand and the meaning of the word in this context rather than the everday use\abuse of it. 'Here' has bgeen moved because it would be stranded by the earlyposition of the preposition.
I don'tsee such a great distance between the relative pronoun and the noun phrase it refers to.
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