The importance of double excitations in each state was assessed using the %T 1 value, which provides the percentage of contribution of all single excitations in an excited state. States with %T 1 smaller than 80% are considered to have a significant double excitation character. We reported the %T 1 values computed at CC3/aug-cc-pVTZ level for transition belonging to small-molecules and at CC3/aug-cc-pVDZ for medium size ones.