Evolution of the (relative to the continuum) line intensities of the BOOTES-2/COLORES spectra, fully covering the second flare event. (a) peak intensities of the Balmer lines measured with respect to the local pseudo-continuum. These Balmer lines appear in strong emission shortly after T0 and this emission decreases in the next days. There is a minimum of Balmer line emission at t − T0 ≈ 0.12 d, coinciding with the time of the second smaller flare event. CaOH depression was the deepest near t − T0 = 0.13 d and it was the shallowest near t − T0 = 0.3 d; (b) the time evolution of the peak intensities of H β and the λ = 5160 Å emission feature are similar although the transient decrease of the relative intensity at t − T0 ≈ 0.12 d is considerably smaller for the λ = 5160 Å feature. The time evolution of the relative intensity of H β is mutually similar no matter if it is related to the local pseudo-continuum or to the λ = 4890 Å feature (justifying that the local continuum is a good measure of the relative intensity of the line); (c) time evolution of the intensities of several spectral features (measured with respect to the local continuum). These features vary less than Balmer lines. The uncertainties of the peak intensities are comparable to the size of the symbols.
