... density¹

Underlined symbols stand for tensors after symmetrizing and subtracting the trace, e.g., $\underline{\mathsf{J}}_{ab}=\tfrac{1}{2}({\mathsf{J}}_{ab}+{\mathsf{J}}_{ba}) -\tfrac{1}{3}\delta_{ab}\sum_c{\mathsf{J}}_{cc}$.

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