Locally resolved isotropic and anisotropicC13Knight shifts in the organic conductor (fluoranthenyl)2X (X=AsF6,PF6)

${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$ Knight-shift tensors including both the isotropic and anisotropic parts of the organic conductors (fluoranthenyl${)}_2$X with X=${\mathrm{AsF}}_6$ or ${\mathrm{PF}}_6$ have been obtained by NMR experiments on powdered samples and on single crystals. It is found that the anisotropic part of the Knight shift yields a more direct access to the local $p_z$ spin-density distribution of the conduction-electron band than the isotropic part.