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Table 3: 
Comparison of spatial accuracy between aortic arch and cervical level (group 1) and the distal cervical level (group 2)
Spatial AccuracyGroup 1 No. (%)Group 2 No. (%)Overall No. (%)
Accurate85 (92.4)43 (72.9)128 (84.8)
Mismatch/inaccurate7 (7.6)16 (27.1)23 (15.2)