# DataSet Structure: Realised Gain

Realised gain is calculated in the same way as gain, except that the power which is reflected back to the input port is taken into account. In other words, system losses and mismatch effects are included.

The formula used to calculate realised gain is

(1) $RG=\text{RealisedGainFactor}×\text{GainFactor}×\left[\text{Re}{\left({E}_{\theta }\right)}^{2}+\text{Im}{\left({E}_{\theta }\right)}^{2}+\text{Re}{\left({E}_{\varphi }\right)}^{2}+\text{Im}{\left({E}_{\varphi }\right)}^{2}\right]$