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Fits of the sheath density distribution model to the observed brightness profiles of Cut A (upper) and Cut B (lower). From the leftmost to the rightmost, the panels show the χ2 values varying with the parameters, dsheath − ρe, dfront − ρe, ΔL − ρe and dfront − dsheath, respectively, and the χ2 values are indicated by the color bars. Dashed lines in each panel indicate the parameters at the minimum χ2.
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