Electron density determination using the simulation fit to the He I 5016 experimental line profile. The relative intensities of the He I 5016 and He I 4922 lines, which can be observed on the left side of the figure, are used as fit parameters. The electron temperature has been taken from the Boltzmann-plot of the Si II lines. This measurement is similar to the one represented in Fig. 11, but here the best fit with He I 5016 is sought.