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		                        | 6:02:56 AM PDT - Tue, May 8th 2012  | 
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		                    Well, I think...
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		                        I think I found two method to fix the atoms. 
 
I found that I can give constraints about the geometry, with typing... 
  set geometry:actlist <integer list_of_center_numbers> 
 
according to the Geometries document page, 
"http://www.nwchem-sw.org/index.php/Release61:Geometry#Cartesian_coordinate_input" 
 
I found one more method. If I want to fix atom 1 and 8 to 13, 
  constraints  
    fix atom 1 8:13  
  end  
 
from "http://www.nwchem-sw.org/index.php/Constraints" 
 
 
Am I right? Here I have another question. what's the difference between above two methods...?!
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		Edited On 6:03:34 AM PDT - Tue, May 8th 2012 by Yjleedaniel
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