| Cumulative production || <math>N_p = \frac{(q_{\text{i}} - q_t)}{D}</math> || <math> N_{\rm p} = q_{\rm i}^{n}/[(1 - n)D_{\rm i}](q_{\rm i}^{1 - n} - q_{\rm t}^{1-n})</math> | | Cumulative production || <math>N_p = \frac{(q_{\text{i}} - q_t)}{D}</math> || <math> N_{\rm p} = q_{\rm i}^{n}/[(1 - n)D_{\rm i}](q_{\rm i}^{1 - n} - q_{\rm t}^{1-n})</math> |