Continuum alignment diagnostic plots for 121 Ca II scans collected from 09:28:36 on 2016 June 19, covering approximately one period of the undulations shown in Fig. 11. (a) WB RMS contrast. (b) Continuum/WB X misalignment. (c) Continuum/WB Y misalignment. Filled circles in (b) and (c): Misalignment measured by use of cross-correlation with MOMFBD restored data, colors represent RMS contrast as shown in (a). Lines in (b) and (c): Shifts in X and Y used for alignment, misalignment smoothed with a heuristic algorithm that gives more weight to the high-contrast data points. Diagnostic plots like these are automatically produced by SSTRED to allow the user to verify how well the contrast-aware smoothing worked.