“…(1), and the other at the bottom, where elementary balances are controlled by improper balances [27,28] and the levels are underpopulated (pLSE recombining) or overpopulated (pLSE ionizing) with respect to the Saha equilibrium. These deviations might result from the existence of gradients in the plasma leading to diffusive processes that alter the balance (2) [31].…”