KIC 10001893 reduced period spacings as a function of the reduced period. Each reduced period spacing is plotted at the mid point between the reduced periods used in its computation. The parameters for the best fit solutions are given in Appendix C. Top panel: Observed reduced period spacings for l = 1 (blue) and l = 2 (red) modes. The discrete values are joined by straight lines to guide the eye. Symbols meaning as in the top panel of Fig. 2. Middle panel: Best-fit solution (green) to the l = 1 (blue) and l = 2 (red) data in the range of periods where data on both mode degrees are available, for the case of a one step-like glitch (case J). The continuous analytical solution is represented by the dashed line, while the filled stars indicate the values of the solution at the reduced periods corresponding to the locations of the observations. Bottom panel: Same as middle panel but for the case of two step-like glitches fitted to all data displayed in the panel (green) (case K).