Extended Data Fig. 3: Raw, smoothed, exposure, and variance images.
From: Extensive diffuse Lyman-α emission correlated with cosmic structure
a. Raw image slice 3910-3920Å, smoothed to 20 pixels or 5.8 arcsec. b. Adaptively smoothed image slice. Note that adaptively smoothing reduces the extended emission levels because bright compact regions above the noise threshold are removed. c. Exposure time (top scale gives seconds, bottom seconds times Δλ. d. Variance cube slice.
