Ratios of the Si IV (λ1393.8–1402.8), N V (λ1238.8–1242.8), and C II (λ1335.7–λ1334.5) lines as a function of time in Visits D, E, and F. Black points correspond to the quiescent stellar emission. Blue and green points show the first and second flare in Visit E, while red and orange points show the peak and decay phase of the flare in Visit F, respectively. Horizontal dashed lines show the expected line ratios in an optically thin plasma for the Si IV and N V lines (the C II line ratio is at ~2.5).