Figure 9. Maps of standard deviation of (a) density, (b) the gray level gy in the schlieren image with horizontal knife-edge ( f ≡ ∂ρ ∂y ) , (c) the gray level gz in the schlieren image with vertical knife-edge ( f ≡ ∂ρ ∂z ) . The colorbars in figures (b) and (c) are adjusted so that the maximum value is in white
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