Observed spectra and the difference spectra of the turning off and on CLQ J0002-0027. Top: the three observed spectra, including the extra BOSS spectrum (blue curve), are shown in the SDSS Legacy rest wavelength range of the object. The epochs for the black, red, and blue spectra are MJD = 51791, 52559, and 55477, respectively. Middle: the difference spectra of the first and second epoch (black curve), and the second and third epoch (red) are shown on the same flux scale, with a constant added to the latter. Bottom: a zoomed in view of the observed spectra in the Hβ (left) and Hα (right) regions is shown.