code: def FPPplots(self, folder=None, format='png', tag=None, **kwargs):
          
          if folder is None:
              folder = self.folder
  
          self.write_results(folder=folder)
          self.lhoodplots(folder=folder,figformat=format,tag=tag,**kwargs)
          self.FPPsummary(folder=folder,saveplot=True,figformat=format,tag=tag)
          self.plotsignal(folder=folder,saveplot=True,figformat=format)
docs: Make FPP diagnostic plots
  
          Makes likelihood "fuzz plot" for each model, a FPP summary figure,
          a plot of the :class:`TransitSignal`, and writes a ``results.txt``
          file.
  
          :param folder: (optional)
              Destination folder for plots/``results.txt``.  Default
              is ``self.folder``.
  
          :param format: (optional)
              Desired format of figures.  e.g. ``png``, ``pdf``...
  
          :param tag: (optional)
              If this is provided (string), then filenames will have
              ``_[tag]`` appended to the filename, before the extension.
  
          :param **kwargs:
              Additional keyword arguments passed to :func:`PopulationSet.lhoodplots`.