The separation of the electric and magnetic fields into components is mathematical, rather than clearly physical, and is based on the relative rates at which the amplitude of parts of the electric and magnetic fields diminish as distance from the radiating element increases. The amplitudes of the far-field components fall off as formula_1, the "radiative" near-field amplitudes fall off as formula_2, and the "reactive" near-field amplitudes fall off as formula_3. Definitions of the "regions" attempt to characterize locations where the activity of the associated field "components" are the strongest. Mathematically, the distinction between "field components" is very clear, but the demarcation of the spatial "field regions" is subjective. All of the fields overlap everywhere, so for example, there are always substantial far-field and near-field radiative components in the closest-in near-field reactive region.