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Hi, i have some trouble with feynman rules after wick's rotation. I don't understand how the propagators transform. In particular if i take the photon's propagator in minkowskian coordinates i dont understand where the factor "-i" goes after the transformation.

## \frac{-i\eta_{\mu\nu}}{p^2} \rightarrow \frac{\delta_{\mu\nu}}{p_E^2} ##

## \frac{-i\eta_{\mu\nu}}{p^2} \rightarrow \frac{\delta_{\mu\nu}}{p_E^2} ##

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