Requests for technical support from the VASP team should be posted in the VASP Forum.
U = χ − 1 − χ 0 − 1 = 1 0.131333 − 1 0.492333 = 5.58 e V {\displaystyle U = \chi^{-1}-\chi_0^{-1}=\frac{1}{0.131333}-\frac{1}{0.492333} = 5.58 eV }