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This yields a modified, or effective Contrast Transfer Function:
<math>K_{eff}(k) = E_tE_s(\sin[(2\pi/\lambda)W(k)]</math>
Examples of temporal aberrations include chromatic aberrations, energy spread, focal spread, instabilities in the high voltage source, and instabilities in the objective lens current. An example of a spatial aberration includes the finite incident beam convergence.<ref>{{Cite web|title = Envelope Functions|url = http://www.maxsidorov.com/ctfexplorer/webhelp/envelope_functions.htm|website = www.maxsidorov.com|accessdate = 2015-06-12}}</ref>
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