code: def get_n_ptrm(tmin, tmax, ptrm_temps, ptrm_starting_temps):
      
      # does not exclude ptrm checks that are less than tmin
      ptrm_checks_included_temps= []
      for num, check in enumerate(ptrm_temps):
          if check > tmax:
              pass
          elif ptrm_starting_temps[num] > tmax: # or ptrm_starting_temps[num] < tmin:
              pass
          else:
              ptrm_checks_included_temps.append(check)
      return len(ptrm_checks_included_temps), ptrm_checks_included_temps
docs: input: tmin, tmax, ptrm_temps, ptrm_starting_temps
      returns number of ptrm_checks included in best fit segment.
      excludes checks if temp exceeds tmax OR if starting temp exceeds tmax.
      output: n_ptrm, ptrm_checks_included_temperatures