Fig. 3
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Spectra of the four H2CO transitions toward six clumps, two from each region. The background color indicates whether a line is at ≥4σ (green) or <4σ (red). The dashed black line indicates the peak velocity of the fit Gaussian for each transition. Examples of clumps with too few lines (N33), differences in ∆υ (N46), or a double peak (G28.28–0.36) are shown.
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