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For the case of non-interacting particles suspended in a (complex) fluid a direct relation between g<sub>2</sub>-1 and the [[mean squared displacement]] of the particles <Δr<sup>2</sup>> can be established. Let's note P(s) the probability density function (PDF) of the photon path length s. The relation can be written as follows:<ref>
{{cite journal
|author=[[Frank Scheffold|F. Scheffold]] ''et al.''
|year=2004
|title=New trends in optical microrheology of complex fluids and gels
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