Howw to scale the nonlinearity in the figure for visual comparison

Here is the code

if true
Vgo=1.2;
Tr=300;
T=[248:423];
n=3.6;
x=1;
Vbetr=0.7;
Vbe=Vgo-(T/Tr)*(Vgo-Vbetr)-((4-n)-x)*(k*Tr/e)*log(T/Tr)
plot(T, Vbe)
end

clearly the plot of Vbe is nonlinear, but I want to visually show it that it is nonlinear in the plot since the plot shows as:

How do I "exaggerate" the nonlinearity of the plot to compare it with a straight line?

[KSSV]

Undefined variables k and e.....

[Rodney Manalo]

those are constants for Boltzmann and Electron charge respectively k=1.38x10-23 and e=1.602x10-19 or in general: k*Tr/e=25.9x10-3

Answer 1

[Ameer Hamza]

Since nonlinear term include log(T/Tr), therefore the nonlinearity will signify at smaller values of T. Consider changing the range of T as follow

T=0:200;

will signify the nonlinearity

.

[Rodney Manalo]

I'd like it to look like this

to give emphasis on the nonlinearity. Like convincing the audience when presenting it.

[Rodney Manalo]

The plot is not to scale. What I'm really asking is how to magnify the nonlinear part of the Vbe to compare it with a straight line

[Ameer Hamza]

The following code will produce something similar

Vgo=1.2;
Tr=300;
T = 0:250;
n=3.6;
x=1;
Vbetr=0.7;
k=1.38e-23;
e=1.602e-19;
Vbe=Vgo-(T/Tr)*(Vgo-Vbetr)-((4-n)-x)*(k*Tr/e)*log(T/Tr);
Vbe_straight=Vgo-(T/Tr)*(Vgo-Vbetr);
plot(T, Vbe, T, Vbe_straight)