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                  MIXING_TYPE {Keyword} | 
               
               
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                  The type of mixing to be employed | 
               
               
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                     This keyword cannot be repeated
                     and it expects
                     
                     precisely one keyword.
                     
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                     Default value:
                     LINEAR_COMBINATION | 
               
               
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                     List of valid keywords:
                     
                     
                        - 
                           
                              - COUPLED
 
                              - Consider the force envs as a two state system with a given coupling matrix element (support only 2 force_evals)
 
                            
                         
                        - 
                           
                              - GENMIX
 
                              - Defines a user-driven generica coupling (support for an unlimited number of force_eval)
 
                            
                         
                        - 
                           
                              - LINEAR_COMBINATION
 
                              - Linear combination of force envs (support only 2 force_evals)
 
                            
                         
                        - 
                           
                              - MINIMUM
 
                              - Use the force env with the minimum energy (support only 2 force_evals)
 
                            
                         
                        - 
                           
                              - MIXED_CDFT
 
                              - Consider each force env as a CDFT state (supports an unlimited number of force_eval for calculation of CDFT properties, but only two states can be mixed for forces).
 
                            
                         
                        - 
                           
                              - RESTRAINT
 
                              - Use the difference between the energy of the force envs as a restraint on the first (support only 2 force_evals)
 
                            
                         
                      
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