In figure 3 isoprene is the first large peak, dipentene elutes at about 11 minutes, and the trimers, tetramers and pentamers can be seen as bunches of peaks at about 20, 30 and 37 minutes respectively.
When pyrolyzed, these polymers regenerate a substantial amount of TDL which elutes at about 19 minutes under the conditions used here, as shown in figure 14.