Fig. 3From: Flammability of some companion species in cork oak (Quercus suber L.) forestsCluster analysis using K-means algorithm. a, b Fresh samples clustered by main flammability variables. c, d Oven-dried samples clustered by main flammability variables. TTI time to ignition (s), PHRR peak heat release rate (kW/m2), AEHC average effective heat of combustion (MJ/kg)Back to article page