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To further precision studies with $B \to K^{(*)} \ell \ell$ decays in thehigh-$q^2$ window uncertainties related to the operator product expansion (OPE)need to be scrutinized. How well can the OPE describe $B \to K^* (\to K \pi)\ell \ell$ angular distributions for a given binning in view of the local charmresonance structure? We present a data-driven method to access thisquantitatively. Our analysis suggests that the bins which are near thekinematic endpoint are best described by the OPE and should be pursued forprecision studies. At the same time measurements with finer binning helpcontrolling the uncertainties.

$B \to K^* \ell \ell$ Standard Model contributions -- Zooming in on high $q^2$