When we look at the covariance images obtained from the strong-field excitation (Figure ), we see a major difference from the results observed upon the ionization and fragmentation induced with the single-photon XUV. In the case of XUV excitation-ionization, the recoil features appeared on the diagonals, corresponding to C 2 H x -fragment loss (shown as dashed boxes in Figure ). However, in the strong-field regime, we see distinct features off these diagonals, e.g., the C 3 H + x ion of interest recoiling against C 7 H + y , or C 4 H + x against C 6 H + y . Such off-diagonal signals indicate odd-carbon loss fragmentation channels, which were not observed in the XUV regime. The most probable reason for such a fragmentation pattern is that a larger variety of final states can be reached in the strong-field multiphoton regime compared to a single-photon excitation due to a change in selection rules.