Fourier transform of the actual star-forming regions observed by Herschel at 350 μm with a 25′′ resolution. Shown are the amplitudes of the decomposed images of Aquila (top left to right) and Rosette (bottom left to right); the scale sizes Sj are annotated at the bottom of the panels. For the original Aquila images with 4096 × 4096 3′′ pixels and Rosette images with 2048 × 2048 3′′ pixels, the panels present the Fourier amplitudes within the range of spatial frequencies from zero to one-third of the Nyquist frequency (0.17 arcsec-1). For better visibility, the spatial frequencies and the pixel values are somewhat limited in range; the color coding is linear.
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