Polarization result mismatch in BaTiO3 crystal

[PR]

Hi all,
I am trying to reproduce the results of polarization in BaTiO₃ using ATK 2014.2 version, as given in your tutorial at link :
http://quantumwise.com/documents/tutorials/latest/Polarization/index.html/chap.batio3.html#sect1.batio3.structure
I am following all the steps as mentioned in tutorial, but getting different values from tutorial result.
Attaching the snapshots of calculation and results which I am getting.
Can somebody tell me the reason for this discrepancy?
What should I do to get the correct results.

[Umberto Martinez]

Your results look fine, the numbers are essentially the same.

[PR]

Thanks for the reply.
The numbers are not same. If you see carefully, I am getting the order of -15 instead of -16 in Total Fractional Polarization second row. 
Can you please explain the reason (if possible). And how can I get the same results as in tutorial.

Thanks

[Umberto Martinez]

Yes I see that, and I read 0.000 and 0.000.
the last value of 0.2846 C/m^2 is more interesting.

[PR]

I didn't get you. I think you are talking about Ionic fractional polarization, while my question is about Total fractional polarization.
Again attaching the snapshot. Please see the highlighted part only and compare the powers (-15 and -16) with your tutorial.
 

[Anders Blom]

Pt is 0 in x and y, but not in z.

1e-15 or 1e-16 is zero, the difference to the tutorial is just numerical noise.