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Fig. 6.

image

Time distance maps overlaid with sinusoids calculated using the MAP parameters output by the MCMC sampling for that respective slit. The sinusoid corresponding to n = 1 is in blue, the sinusoid corresponding to n = 3 is in green, and their sum is shown by the dashed black line. The average displacement of the loop for each slit has been added so the curves line up with time distance map behind it. Top: slit 26 as shown in Fig. 3. The summed curve clearly deviates from a pure sinusoid as per the time distance map behind it, as a result of the third harmonic. Bottom: slit 59 at the apex. Despite being an antinode for the third harmonic, the summed curve does not deviate far from a pure sinusoid due to the large amplitude of the n = 1 component.

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