K.A. Heufer, H. Olivier: Determination of ignition delay times of different hydrocarbons in a new high pressure shock tube. Shock Waves, 2010, 20, 307-316, Fig. 12, red triangle, PRE-IGNITION DATA (T .lt. 900 K) from: Heufer, K.A., Olivier, H., Vranckx, S., Lee, C., Fernandes, R.X.: Experimental study of the high-pressure ignition of alcohol based biofuels. ECM 2011 Cardiff