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TABLE 2: Peak systolic and diastolic velocities in the patients
Patient No. Tonsillar Herniation (mm) Age (yr) Syrinx Aliasing or Other Artifact Peak Systolic Velocity Peak Diastolic Velocity
1 5 21 None 2.3 2.5
2 5 23 None 3.7 4.5
3 5 28 Syrinx 1.9 3.8
4 5 29 None 1.8 2.9
5 4 57 None 3.5 5.3
6 9 29 Syrinx Aliasing 4.8 4.8
7 9 19 Syrinx Phase artifacts 3.5 3.4
8 11, crowding 20 None Aliasing 2.8 4.6
Average 28.3 3.0 4.0

Patient No.	Tonsillar Herniation (mm)	Age (yr)	Syrinx	Aliasing or Other Artifact	Peak Systolic Velocity	Peak Diastolic Velocity
1	5	21	None		2.3	2.5
2	5	23	None		3.7	4.5
3	5	28	Syrinx		1.9	3.8
4	5	29	None		1.8	2.9
5	4	57	None		3.5	5.3
6	9	29	Syrinx	Aliasing	4.8	4.8
7	9	19	Syrinx	Phase artifacts	3.5	3.4
8	11, crowding	20	None	Aliasing	2.8	4.6
Average		28.3			3.0	4.0