An explicative example.

<p>Iteration 0: initialization with the candidate o-space centres {<i>O</i>} coincident with the transitional segment of each individual {<i>C</i>}. Iteration 1: first graph-cuts run; easy groups are correctly clustered while the most complex still present errors (the FCG formed by <i>P</i><sub>7</sub> and <i>P</i><sub>20</sub> violates the visibility constraint). Iteration 2: the second graph-cuts run correctly detects the <i>O</i><sub>7,8,9</sub> F-formation (at the bottom). Se text for more details.</p>