[Wien] Different results with different versions of Wien2k

[Abel Fenta]

Dear Professor
I am running wien2k, version 2012 and 2013, on Ubuntu 12.04 operating system
and ifort 11.1 compiler.
My purpose is calculating EFG of graphene, with different ad-atoms, like Hg, In and Cd, on different sites. I use supercell 3x3x1.
Surprisingly I'm getting different values ​​for the energy using version 12 and 13? What can be happening in your opinion?
I send a graph of the energy as a function of distance from the Hg atom to graphene.
Thank you.

Best regards,
Abel Fenta
-------------- next part --------------
A non-text attachment was scrubbed...
Name: ex_1.odt
Type: application/vnd.oasis.opendocument.text
Size: 20263 bytes
Desc: ex_1.odt
URL: <http://zeus.theochem.tuwien.ac.at/pipermail/wien/attachments/20140304/25ef3023/attachment.odt>