Photolysis rate coefficients J_s(z) as a function of altitude for selected chemical reactions, computed in VULCAN for the YMDF and FF stellar models, and shown for the upper layers of the simulated atmospheres. Dashed lines show the atmospheric state at the end of the 10-day integration, solid lines at 360 days. In the left two panels, lines with markers correspond to the YMDF simulation at 260 days after the largest flare at day 243, and, in the two panel to the right, these lines correspond to the FF simulation at 140 days after the largest flare at day 136.