なんのことはない基本的なもの。
- S= 1/2
Sma4: a*(1-exp(-(x-b)/c)) - S= 3/2
Sma4: a*(1-0.1*exp(-(x-b)/c)-0.9*exp(-6*(x-b)/c)) - S= 7/2
Sma4: a*(1-0.0119*exp(-(x-b)/c)-0.06818*exp(-6*(x-b)/c)-0.206*exp(-15*(x-b)/c)-0.7136*exp(-28*(x-b)/c))
Albert Narath, Phys. Rev. 162, 320 – Published 10 October 1967