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Table 2 Example calculation of Position Shift Error (PSE). See Equation: 4 and associated text for explanation.

From: OXBench: A benchmark for evaluation of protein multiple sequence alignment accuracy

a) Reference Alignment
1 2 3 3.5 4 5 6 7
G K L - M R A Y
G K P H K L R L
1 2 3 4 5 6 7 8
b) Test Alignment
1 2 3 4 4.5 5 6 7
G K L M - R A Y
G K P H K L R L
1 2 3 4 5 6 7 8