3D-EELS tomographic mapping of the localized surface plasmon resonances (LSPR) on a 100 nm silver nanocube deposited on a 30 nm thick silicon nitride substrate: (a) EELS spectrum recorded for the probe position marked in blue on the HADF image and identification of the spectral components (α, β, γ, δ, and ε) to be attributed to LSPRs on the cube, also visible are the zero-loss tail and the bulk silver plasmon (in black); (b) the reconstructed 3D map of the identified specific components (from Nicoletti et al. [121]).