.\end{aligned}$$ This implies $$\begin{aligned} &\int_{\mathbb{R}^n} \varepsilon^{n-0} \, (\varepsilon^0 + |x|^0)^{0-n} \, \sum_{i,k,l=0}^n (\partial_l \overline{H}_{ik}(x))^0 \, \delta_{pq} \\ &= \frac{0