RDF analysing

Hi Dr. Axel:

I have a problem in analysing of RDF in VMD by employing dump of lammps.
I have 2 system
1.zeolite with one unit cell
2.Zeolite with 4 unit cell.
I analyse the RDF of Al in zeolite to Na ions (Al-Na)
I expect to have the same results in both system.
but I have not . the RDF of Al -Na in system that include 4 unit cell is different and more than in one unit cell

thanks
sincerly,
Ramin

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please post questions about VMD to the VMD-l mailing list
where they belong and not here. thanks. axel.