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Equilibrating Surface Temperature Through NVT Ensemble Ab Initio Molecular Dynamics

In my AIMD simulations with the NVT ensemble at T= 300K (Nosé–Hoover thermostat)for a Pd (111) surface (2*2, 6 layers) and vacuum sizes of 14 Å and 18 Å, All other INCAR tags are same(only NGZ for 14Å (123) and 18Å (143)), I've observed two distinct graph time step versus temperature. I'm seeking clarification on the accuracy of these graphs. If accurate, can it be inferred that increasing the vacuum size leads to a reduction in Temperature fluctuation?Image may be NSFW.
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vacuum 14Å pd(111)surface
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time step vs temperature graph at 14Å vacuum
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vacuum 18Å pd(111)surface
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time step vs temperature graph at 18Åvacuum
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CONTCAR file for 14 Angstrom
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CONTCAR file for 18 Angstrom


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