Fig. 1
(Left) Optical image centred on the position of the ULX candidate NGC 1068-X2. North is up and east to the left. The radius of the circle is centred on the X-ray nominal position and is 1 arcsec. The solid horizontal line is shown for scale and has 5 arcsec. (Right) Spectra of the optical counterpart of the ULX candidate. For visual purposes, the spectrum has been slightly smoothed.
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