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    $\begingroup$ Akhiezer, not for the faint of heart ... $\endgroup$
    – my2cts
    Commented Jun 18 at 8:29
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    $\begingroup$ On some level the corrections have to be of this form, since they're the only possible terms that are frame-independent and parity-even. The real question is what the values of $a$ and $b$ are. $\endgroup$ Commented Jun 18 at 12:41