Python Example code
from pylab import *
t,v = loadtxt("N2data",unpack=True)
omega = pi/t
params, cov = polyfit(omega,v,1,cov=True)
plot(omega,v, 'go')
plot(omega, params[0]*omega+params[1], 'r-')
title("Demonstration of Linear Fitting")
xlabel("$\omega$ (rad/s)")
ylabel("V (mV)")
print("slope = ", params[0])
show()