Example inversion weights for 1 Mm depth and effect of the minimisation of the spread S. A strong regularisation ϵ confines the inversion weights in the spatial domain (bottom row, ϵ = 100.5) compared to the case ϵ = 0 (top row). The cut at y = 0 (horizontal black line) is displayed on the right-hand-side panel, where the values of were scaled by .
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