TeX source:

WCI = \left\{ \begin{array} {lll}T & \text { if } 0 ≤ v ≤ 6.5  \\33 - \dfrac{10.45+5.29\sqrt v - 0.279v}{22} (33-T) & \text { if } 6.5 ≤ v ≤ 72 \\ 1.6T - 19.8 & \text { if } 72 < v \end{array} \right.