Fig. 3.
Example expansion measurement in region D of G350.1−0.3 (see Sect. 4.6). Top and middle panels: exposure corrected images at the early and late epoch, and the white rectangle marks the measurement region. Bottom panel: one-dimensional flux profiles Fi(x) at the early (red) and late (blue) epoch. The markers display the binned distributions with errors, and the solid lines reflect the flux profiles smoothed by a Gaussian kernel. The dashed red line corresponds to the profile of the early epoch, shifted and rescaled by the indicated parameters (see upper right corner), with the shaded area displaying the associated uncertainty from bootstrapping. We define the x coordinate such that it increases in radial direction, meaning from west to east in this case.
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