... flows

The above analysis may be similarly applied to the redshifted lobe, by exchanging $P_{\rm blue}$ and $P_{\rm red}$ while keeping $\alpha$ the same. The resulting errors in momentum, age, and thrust will be the same as for the blue lobe for given values of $\eta$ and $\alpha$. Our conclusions also remain valid if  $P_{\rm blue}$ and  $P_{\rm red}$ are summed globally over the whole outflow, provided one considers a value of $\eta$ suitably averaged between both lobes. However, it is often preferable to perform observational estimates in each lobe separately, especially when the lobes are asymmetric (a rather common case).

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