KIC 10553698A echelle diagrams displaying the data for l = 1 (blue) and l = 2 (red) modes, along with the best fit model for the case of a one step-like glitch (green). The continuous analytical solution is represented by the full line in the reduced periods’ range in which the fit was performed and by a dotted line in the range not considered in the fit. Left panel: Fit to l = 1 and l = 2 modes’ reduced periods smaller than 11 100 s (case C). The data used in this fit were also used to construct the reduced period spacings for case B in Table 1, whose fit is shown in the bottom panel of Fig. 2. Right panel: Fit to l = 1 and l = 2 modes’ reduced periods in the full range (up to n = 34) extracted from Table A.2 (case E). When several modes are listed for a given radial order and degree (or for the same trapped mode), one single mode was picked randomly (see text for details).