EIS and AIA DEMs calculated at two different times. First row is from the 13:23−13:31 UT EIS raster. Second row is from the 21:10−21:19 UT raster. The intensities used for the DEMs are average values in the east region (big box in panels d) and h)) and in the background (small box in panels d) and h)). a), e) east region DEM for EIS (blue,orange) and AIA(green,red). b), f) Background DEM for EIS and AIA. c), g) east/background ratio. The blue and green lines use the Poisson noise as intensity error for the DEM calculation. The orange and red lines use 20% of the intensity value as intensity error. d), h) AIA 211 Å image showing the selected AR and background regions.