Fig. 1. Instantaneous WOR vs. cumulative WOR $\begin{array}{l}ΣWOR\end{array}$ :

(1)	$\begin{array}{l}\displaystyle WOR = \frac{\alpha_W(t) \cdot q_W^\uparrow}{\alpha_O(t) \cdot q_O^\uparrow}\end{array}$

(2)	$\begin{array}{l}\displaystyle ΣWOR = \frac{ \int\limits_0^t \alpha_W(t) \cdot q_W^\uparrow \, dt}{ \int\limits_0^t \alpha_O(t) \cdot q_O^\uparrow \, dt}\end{array}$

(3)	$\begin{array}{l}\displaystyle E[\alpha_W(t), \alpha_O(t)] = \sum_t \ \min D \big( P_{\rm mod}(t), P_{\rm hist}(t) \big)\end{array}$

(4)	$\begin{array}{l}\displaystyle D \big( P_1}(t), P_1(t) \big) = \sqrt{ \big( WOR_1 - WOR_2 \big)^2 + \big( ΣWOR_1 - ΣWOR_2 \big)^2 }\end{array}$

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