Comparison between the Hα+[NII] flux (left) and EW (right) detected in the central 3 arcsec in the imaging data and in the nuclear spectra, the right panel includes the 36 spectra taken at Loiano. Blue are strong detections, green are weak detections (the most discrepant object is N4526). The sources of observations of nuclear spectra are provided in Table A.5. The 45 degree lines serve to guide the eye to the proportionality relations.
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