Same as Fig. 2, but for all the reported C60 sources. The typical error bar is indicated in the lower left-hand corner. The solid curves denote the predicted values by thermal models with temperatures from 300 to 1000K at an interval of 100 K, for which the A-values (from up to down) are taken from Martin et al. (1993), Chase et al. (1992), and Choi et al. (2000), respectively.