Electron density Saha Ionization Equation

Saha-Boltzmann equation describes the ratio of number densities between any two consecutive ionization states and its product with the number electron density i.e.
$$n_e\frac{n_{i+1}}{n_{i}}$$
Here, ##n_e## is the electron number density, ##n_{i+1}## is the number density in ##i+1## ionization state and ##n_i## is the number density in the ##i## ionization state. My question is regarding the factor ##n_e##. Which electron density is this actually? Is it the electron density produced as a result of ionization from ##i## state to ##i+1##?
 
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DrClaude

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It is the total electron density.
 

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