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The standard deviation of the residual is decreasing until no more significant structures are found. The convergence can be estimated from the residual. The algorithm stops when:
$\displaystyle \frac{ \sigma_{{R}^{(n-1)}} - \sigma_{{R}^{(n)}}}
{ \sigma_{{R}^{(n)}}} < \epsilon$     (14.121)

Petra Nass