Emission rate of ionizing photons as function of time during the stripped phase of three models with initial masses of M_init = 18.17 (left column), 12.17 (middle column), and 8.15 M_⊙ (right column). We show the emission rates of H I-, He I-, and He II-ionizing photons in the top, middle and bottom rows respectively. The constant rates that we assume when creating the population synthesis are shown as colored boxes (see Sect. 2.2), while the results from atmosphere models that are modeled at different times during the stripped phases are shown as colored dots connected with a line. The prediction from assuming blackbody radiation from the stars is shown in gray. We hatch the time when the star is not stripped.