Thermal-dynamical evolution of the sampled BSAD. (a) AIA 131 Å image at 13:12:56 UT. (b) Space-time map obtained along the dotted line AB. (c) Space-time map obtained along the dotted line CD. (d) Variation in T (blue line), EM (red line), and emission (black line) vs. time extracted from the red box in panel (a). The uncertainties on the velocities were estimated as the error in the length measurement, which was considered to be about 0.6 arcsec (about one pixel length of SDO/AIA).