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Fig. 1

image

Left: HST/WFC2 image of IC 3639 acquired with the filter F606W. The black rectangle represents the size of the slit used to extract the VISIR spectrum (0.′′ 75 × 0.′′52), while the green square corresponds to the slit size and orientation of the Spitzer/IRS-SH observations (9.9–19.5 μm, 4.′′ 7 × 11.′′3). Right: HST/FOC image acquired with the filter F210M from González Delgado et al. (1998). The white contours correspond to the VISIR/SPEC NEII filter image. The orientation of the different baselines used for MIDI observations are indicated by the blue (UT2–UT3), green (UT1–UT2), and red (UT3–UT4) lines.

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