A Better Fit for the 5.1 V Zener Diode

By using the diode equation and tinkering with the fit procedure I was able to get a better fit for the 5.1 V Zener diode.

I made another set of measurements and they are in good agreement with the first set. There still seems to be some residual error greater than the precision of the measurements. Most of the error is above 4.0 volts. So I should probably checked for internal resistance.