An example of the results of the clustering algorithm described above. Shown in the colours are the estimated azimuths as a function of time and period for an observation made on 25th July 2017 (observation ID: L601030). The coloured outlines indicate the three clusters identified within the fit results. The coloured crosses indicate the point within each cluster at which the highest amplitude was estimated. All coloured regions outside the clusters shown were classified as noise. The cross-hatched region shows the cone of influence.