Observations from Spitzer-IRS over 13–17 μm (black) with continuum as fitted (blue) for the eight selected sources. Typical rms noise on the continuum is shown under the object name. DN Tau, GW Lup and LKHα 270 had a spike in the observed flux at 16.48 μm due to artefacts at the edge of the observing order. This single data point has been removed from these three spectra.
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