GISS_aom 20thc run 2: No stadium-wave signature. (a) Two plots are given. The first is the M-SSA spectrum for this model. No modes fall outside the red-noise envelope; thus no significant mode can be identified. The second plot in (a) shows the cumulative variance accounted for by the first twenty modes. (b) Shows the RCs. The first two are interdecadal; yet their phasing is in-phase. The signal, therefore, does not propagate through the indices. All tests for a stadium-wave signal are failed for this model’s data set.