Left: average spectra in various EW6.2 bins in the 4 − 10 μm range. The dashed lines correspond to the underlying continuum emission as inferred by PAHFIT. The grey shadowed area depicts the 8.0 μm IRAC filter. Right: average (dashed lines), and average continuum subtracted (solid lines) spectra of of all galaxies with EW6.2 ≥ 0.4 μm grouped in those with IR8 > 6 (orange lines), and IR8 < 6 (black lines).
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