# set terminal png transparent nocrop enhanced font arial 8 size 420,320 
# set output 'electron.1.png'
set dummy Vbe,y
set grid nopolar
set grid xtics nomxtics ytics nomytics noztics nomztics \
 nox2tics nomx2tics noy2tics nomy2tics nocbtics nomcbtics
set grid layerdefault   linetype 0 linewidth 1.000,  linetype 0 linewidth 1.000
set key 0.2, 0.0045, 0 right top vertical Right noreverse enhanced autotitles box linetype -1 linewidth 1.000
set samples 160, 160
set title "Mutual Characteristic of a Transistor" 
set xlabel "Vbe (base emmitter voltage)" 
set xrange [ 0.00000 : 0.750000 ] noreverse nowriteback
set ylabel "Ic (collector current)" 
set yrange [ 0.00000 : 0.00500000 ] noreverse nowriteback
Ie(Vbe)=Ies*exp(Vbe/kT_q)
Ic(Vbe)=alpha*Ie(Vbe)+Ico
Ies = 4e-14
kT_q = 0.025
alpha = 0.99
Ico = 1e-09
plot Ic(Vbe)