Before revision:  They define analogues of magnetic field h and the inverse temperature (\beta) in Ising model\beta*\beta* \beta*  . Sparks terminate via a phase transition known as "hpolarity reversal" and the leak emerges when hfails to change its sign.
After revision:  They define analogues of magnetic field h and the inverse temperature (\beta) in the Ising model, for which we have explicit formulas in terms of SR Ca and release channel opening/closing rates. The classification of leak regimes takes the shape of a phase \beta-h diagram, with the regime boundaries occurring at h=0 and a critical value of \beta (\beta*\beta* \beta* . Sparks terminate via a phase transition known as "hpolarity reversal" and the leak emerges when hfails to change its sign.