Same as Fig. 2, but at 78 keV (1.5 keV energy bins). The best-fit values are (78.9 ± 1.5) keV for the centroid, (1.9 ± 0.6) keV for the width (FWHM), yielding an expansion velocity of (4300 ± 1600) km s^-1, and (2.1 ± 0.4) × 10^-5 ph cm^-2 s^-1 for the flux, which is equivalent to (1.5 ± 0.4) × 10^-4 M_⊙ of ⁴⁴Ti. The raw count spectrum (gray) increases by two orders of magnitude below 70 keV with respect to 80 keV, which introduces strong systematic effects.