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Fig. 3
Tomogram and eigenspectrum 3 of the PCA tomography applied to the 5675−6700 Å spectral range. This range includes the [N II]λ5755 emission line, which is sensitive to the high temperatures of the ionized gas. The eigenvector reveals a correlation between all emission lines and the blue component of the continuum.
This figure is made of several images, please see below:
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