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, versus the observation angle at X L ¼ 90 ; h L ¼ 30 in percent of the incident amplitude (a) r ¼ 2k L , (b) r ¼ 8k L , (c) r ¼ 500k L. Solid line represents the absolute error between initial UTD and UAT total fields and dashed line represents absolute error between modified UTD and UAT, FIG. 10. Absolute error between UTD and UAT total fields in percentage of the incident displacement amplitude

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