Download from Blueline the data file of the viscosity of o-terphenyl (in Pa s) as a function of temperature (in K) \"python_OTPVISCOSITY.txt\" and save it in a well-known location on your computer.

a) Write a python program that opens the data file, assigns the first column of data to be the temp and the second to be the visc value. Generate a plot of the log(visc) vs temperature with appropriate x and y labels.

b) Modify your python code so that it performs a curve fit of the data set to a Vogel-Tammann- Fulcher function of the form: B In n(t) = A + T-T where A, B and T. are parameters to be optimized starting from initial guess values of A = -8, B = 1200, and T. = 210. Use the optimized parameters to generate a fit line plotted onto the original data plot of part a.