code: def get_new_T_PI_parameters(self, event):
          
  
          # remember the last saved interpretation
          if "saved" in list(self.pars.keys()):
              if self.pars['saved']:
                  self.last_saved_pars = {}
                  for key in list(self.pars.keys()):
                      self.last_saved_pars[key] = self.pars[key]
          self.pars['saved'] = False
          t1 = self.tmin_box.GetValue()
          t2 = self.tmax_box.GetValue()
  
          if (t1 == "" or t2 == ""):
              print("empty interpretation bounds")
              return
          if float(t2) < float(t1):
              print("upper bound less than lower bound")
              return
  
          index_1 = self.T_list.index(t1)
          index_2 = self.T_list.index(t2)
  
          # if (index_2-index_1)+1 >= self.acceptance_criteria['specimen_int_n']:
          if (index_2 - index_1) + 1 >= 3:
              if self.Data[self.s]['T_or_MW'] != "MW":
                  self.pars = thellier_gui_lib.get_PI_parameters(self.Data, self.acceptance_criteria, self.preferences, self.s, float(
                      t1) + 273., float(t2) + 273., self.GUI_log, THERMAL, MICROWAVE)
                  self.Data[self.s]['pars'] = self.pars
              else:
                  self.pars = thellier_gui_lib.get_PI_parameters(
                      self.Data, self.acceptance_criteria, self.preferences, self.s, float(t1), float(t2), self.GUI_log, THERMAL, MICROWAVE)
                  self.Data[self.s]['pars'] = self.pars
              self.update_GUI_with_new_interpretation()
              self.Add_text(self.s)
docs: calcualte statisics when temperatures are selected