Fig. A.2
Δ-variance of the observed C18O emission line map (dashed line) and the noise emission across the C18O map in Fig. A.1 (dotted line). Their difference represents a pure Δ-variance free of the noise effect (full line). The vertical line denotes the critical scale lc = 0.66 arcmin at which the pure Δ-variance curve is the steepest. 1σ error bars are presented.
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