Improvement of experimental data via consistency conditions

Interdependencies between experimental spectra, representing line or plane projections of electronic densities, are derived from their consistency and symmetry conditions. Some additional relations for plane projections are obtained by treating them as line projections of line projections. The knowledge of these dependencies can be utilised both for an improvement of experimental data and for a verification of various techniques used for correcting for example two-dimensional (or one-dimensional) angular correlation of annihilation radiation spectra and Compton scattering profiles.