The lower panel shows the parameters attributed to the knots . Therefore, the smoothing spline is allowed to be less 'stiff' in this region and follows the shape of the knots. The smoothing spline was then allowed to follow the shape of the feature accurately. The calibration sources were selected to cover a wide diversity in spectral types. This allowed to avoid biases to spectral features typical for different spectral classes.
Composites are pieces of synthetic spectra and real data spliced to photometric points.
The calibration sources for the corrections of the RSRF in OLP 10, the version of the ISO data reduction pipeline used for the legacy archive. We mentioned in Section 5.5.3 that 3 features in the ILT RSRF of band 2C and one feature in band 3A were understood to be artifacts. Although the RSRFs in OLP 10 have been corrected for these features, residues of these features can remain in these wavelength regions. All spectral bands of the SWS show fringing caused by one or multiple sets of parallel surfaces in the lightpath that act as a Fabry-Perot system. Order selection filters cause fringing in bands 1 and 2.