This class implements a callback to print information about selected 
  Ramachandran plot points.
  It is implemented as a class with a __call__ method so that it is easy
  to store information about the run, including a reference frame from the 
  simulation and the phi and psi analyses that make up the Ramachandran 
  analysis.
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          | __init__(self,
        reference_frame=None,
        rama=None) x.__init__(...) initializes x; see help(type(x)) for signature
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          | getIndexInfo(self,
        index) Return an identifying string for the residue index provided.
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          | addPoints(self,
        frame_id,
        points) Add points to be tracked.
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    |  | 
        
          | __call__(self,
        mouseevent) The method that is used for the callback.
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    | Inherited from object:__delattr__,__format__,__getattribute__,__hash__,__new__,__reduce__,__reduce_ex__,__repr__,__setattr__,__sizeof__,__str__,__subclasshook__ |