code: def display_timestamps_pair(time_m_2):
      
      if len(time_m_2) == 0:
          return '(empty)'
  
      time_m_2 = np.array(time_m_2)
      return '({}, {})'.format(
          display_timestamps(time_m_2[:, 0]),
          display_timestamps(time_m_2[:, 1]),
      )
docs: Takes a list of the following form: [(a1, b1), (a2, b2), ...] and
      returns a string (a_mean+/-a_error, b_mean+/-b_error).