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I'm calculating condensed Fukui functions to explain the reactivity of my molecules.

The manual for Multiwfn suggests using atomic dipole moment corrected Hirshfeld charges for it. However I get strange results, on some atoms in which $f^+$ is negative.

I'm using def2-TZVPD basis set, and I'm wondering if diffuse functions can make Hirshfeld charges meaningless as they do for Mulliken charges?

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