Model fits to thermochronological data of the nine indicated meteorites of class H. Squares with error bars indicate the empirical data for closures time of some radiometric clocks with different closure temperatures. Full red lines correspond to the temperature evolution at the derived burial depths of the individual meteorites for an optimised model of the parent body of the H chondrites calculated with a heat conductivity of the chondritic material as calculated in this work. The full black line corresponds to the case that a prescription for the dependence of the heat conductivity on porosity, as proposed in Henke et al. (2012a), is used in the calculation. The short dashed lines show the time evolution of the central temperature of the body.