code: def delete_fit(self, fit, specimen=None):
          
          if specimen == None:
              for spec in self.pmag_results_data['specimens']:
                  if fit in self.pmag_results_data['specimens'][spec]:
                      specimen = spec
                      break
          if specimen not in self.pmag_results_data['specimens']:
              return
          if fit in self.pmag_results_data['specimens'][specimen]:
              self.pmag_results_data['specimens'][specimen].remove(fit)
          if fit == self.current_fit:
              if self.pmag_results_data['specimens'][specimen]:
                  self.pmag_results_data['specimens'][specimen][-1].select()
              else:
                  self.current_fit = None
          self.close_warning = True
          self.calculate_high_levels_data()
          if self.ie_open:
              self.ie.update_editor()
          self.update_selection()
docs: removes fit from GUI results data
  
          Parameters
          ----------
          fit : fit to remove
          specimen : specimen of fit to remove, if not provided and
          set to None then the function will find the specimen itself