| r | correlation coefficient |
| xi | values of the x-variable in a sample |
| mean of the values of the x-variable | |
| yi | values of the y-variable in a sample |
| mean of the values of the y-variable | |
| F(ka) | Debye function |
| UE | electrophoretic mobility |
| η | viscosity of the medium |
| ε | dielectric constant |
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