Guess:[4, 39.2, 46, 3.7]
Fit:[ 3.65348444 16.15585606 24.74155084 6.03393715]

InflPointLoc:719
LinVoltageSpace[InflPointLoc]:8.74 V
AzoozUfl:-2.33 V
AzoozUfl+Shift(20.00 V):15.29 V

Guess:[6.3, -34.5, 21.3, 0.02]
Fit:[ 7.46361628 -6.97778463 21.72943998]
$I_{sat}=$7.46

Guess:[6.3, -34.5, 21.3, 0.02]
Fit:[ 1.81426671 -4.09354359 5.10973219 0.04344674]
$I_{sat}=$1.81