Magnetic flux emergence and CME source regions. (a) Mean unsigned magnetic flux (green, 3-hour windows) and 6-hour average flux emergence rate of AR 13664/8 (red). The error bars are at 3σ within each window. (b)-(h) CME (E1-E7) source regions in AIA 304 Å and 131 Å. The green and red bars point to the locations of filament/hot channel. Positive (blue) and negative (red) fluxes (±1000 G) are overplotted.