A plot of the @Q05007@ @O04322@ of an excited molecular entity by a series of quenchers versus the @E02257@ energy of the quenchers. Alternatively, a plot of the @O04322@ for the @S05607@ of a reaction versus the @E02257@ energy of different sensitizers. This type of plot is used to estimate the energy of the excited molecular entity quenched (in the former case) or produced (in the latter case).