A kaolin-in-water suspension was tested in a $13 \mathrm{~mm}$ internal diameter horizontal tube, and the following data were reported:

$\Gamma\left(\mathrm{s}^{-1}\right)$	660	803	978	1208	1518	1790	2081	2300	2629	2988
$\tau_{w}(\mathrm{~Pa})$	37.7	38.4	40.1	41.7	43.3	44.8	46.7	48.2	62.7	73.6

Obtain the true shear stress, shear rate, and viscosity for this suspension. Does this suspension exhibit a yield stress? Fit a suitable viscosity model to approximate the rheology of this suspension.