(a) Heave data from the Scarborough Datawell Directional Waverider MkIII from 13 January 2017, 13:00Z to 13:30Z, with wave traces flagged during quality control highlighted in red. (b) The original wave spectrum derived from the processing of the heave data, including those wave traces flagged in the QC process (Hm0 = 6.93 m). (c) The reprocessed wave spectrum derived from the heave data, excluding wave traces flagged during the QC process (Hm0 = 5.87 m). The energy in the spectra has been normalised