Did you use twin refinement (is it really twin if you used that). 
If twin refinement was used then twin related intensities might have different 
resolution, in case when your crystal are pseudomerohedral twinned. 

Regards
Garib

> On 4 Apr 2024, at 18:40, venkatareddy dadireddy <venkatda...@gmail.com> wrote:
> 
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> --
> 
> Hi Kay,
> 
> Thank you very much for your insights. 
> Following are the cell parameters from mtz and pdb header.
> MTZ: 117.8560   66.1700   70.9040   90.0000   91.4240   90.000
> CRYST1  117.856   66.170   70.904  90.00  91.42  90.00 C 1 2 1
> 
> The only difference is in the 3rd decimal point.
> 
> 
> Thank you,
> Venkat
> 
> 
> 
> On Tue, Apr 2, 2024 at 10:10 PM Kay Diederichs 
> <kay.diederi...@uni-konstanz.de <mailto:kay.diederi...@uni-konstanz.de>> 
> wrote:
> Hi Venkatareddy Dadireddy,
> 
> do the unit cell parameters of your MTZ file and PDB file agree exactly ?
> 
> Take for example a cell of (100,110,120,90,90,90) in the header of the MTZ 
> file, 
> and (97,110,120,90,90,90) in the CRYST1 line of the PDB file.
> 
> In this example, the (50,0,0) reflection would be at 2.0A resolution if using 
> the cell from the MTZ file, 
> but it would be at 1.94A resolution if calculating the resolution based on 
> the cell from the PDB file.
> 
> So perhaps REFMAC5 takes the cell from the PDB file, and phenix.refine takes 
> the cell from the MTZ?
> I didn't check but it may be worth finding out. 
> 
> HTH,
> Kay
> 
> 
> On Tue, 2 Apr 2024 21:16:57 +0530, venkatareddy dadireddy 
> <venkatda...@gmail.com <mailto:venkatda...@gmail.com>> wrote:
> 
> >Hi,
> >
> >The resolution range in my MTZ file is 70.88 - 2.0 A. When I refined my
> >structure using REFMAC5, the resolution that it gives is 70.88 - 1.94 A,
> >the difference of 0.04 A. I also used Phenix.refine which gives the
> >resolution output as it is in the MTZ file. Again, EDS (validation report)
> >gives the right resolution. What could be the possible reason for this
> >discrepancy? I have the structure deposited in the Protein Data Bank and it
> >is on hold. Thank you in advance for your help.
> >
> >Thank you,
> >
> >
> >
> >
> >
> >
> >*Venkatareddy Dadireddy,B1-10,Prof. S. Ramakumar's Lab,Dept. of
> >Physics,IISc, Banglore.Cell: 07259492227*
> >
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> -- 
> Venkatareddy Dadireddy,
> B1-10,
> Prof. S. Ramakumar's Lab,
> Dept. of Physics,
> IISc, Banglore.
> Cell: 07259492227
> 
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