Upper panel: the estimated DEM from six AIA EUV channels (171 Å, 193 Å, 211 Å, 131 Å, 335 Å, and 94 Å) around 09:33:37 UT (at 93 s, black profile with green error bars) and 09:34:25 UT (at 141 s, red profile with blue error bars) at theregion indicated with the red rectangles in Fig. 2. The colors from light to dark correspond to the confidence interval with a confidence level of 50%, 80%, and 90%, respectively. Middle panel: the emission measure of the 171 Å, 193 Å, and 211 Å channels obtained by integrating the DEM profile over the temperature range of 10^5.7 − 10^6.1 K, 10^6.05 − 10^6.3 K, and 10^6.15−10^6.35 K, respectively. The error bars are estimated from the confidence interval with a confidence level of 90%. Lower panel:the electron density estimated by , where d z is assumed to be a constant of 500 km. See Sect. 4.