The total EII rate coefficient averaged over a Maxwell-Boltzmann electron energy distribution at temperature *T* is given by the Burgess-Tully type scaling. The temperature *T* is scaled as

where*t = k*_{b}T/E_{0} for electron energy *E*_{0} and *f* is a constant scaling parameter. The rate coefficient is scaled as

where*E*_{1} the first exponential integral.

The scaled rate coefficient is fitted by the polynomial form

where

where

The scaled rate coefficient is fitted by the polynomial form

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