Thermal characteristics in two large plumes. a1–a5: 193 Å image, total emission measures, EM average temperature, emission measures at log T = 6.0 − 6.3, and emission measures at log T = 6.0 − 6.3 at 06:34:22 UT. b1–b5: same as panels a1–a5 at 08:11:22 UT. c1 and c2: average EM curves in the red and blue boxes of panel a1 for the first large plume. d1 and d2: average EM curves in the red and blue boxes of panel b1 for the second large plume. The corresponding background EM curves are derived from the corresponding quiet Sun away from the prominence (red and blue boxes in Fig. 1a). The uncertainties were estimated using the Monte-Carlo experiment.