Index

Macromolecular dictionary (mmCIF) version 2.0.09

_phasing_MIR_der_shell.power

Definition:

   The mean phasing power P for reflections for this derivative
   in this shell.

              sum|Fh~calc~^2^|
   P = (----------------------------)^1/2^
        sum|Fph~obs~ - Fph~calc~|^2^

   Fph~obs~  = the observed structure-factor amplitude of the
               derivative
   Fph~calc~ = the calculated structure-factor amplitude of the
               derivative
   Fh~calc~  = the calculated structure-factor amplitude from the
               heavy-atom model

   sum is taken over the specified reflections

Type: float

Mandatory item: no

Category: phasing_MIR_der_shell