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90187a33e1
Adjust the relaxation step to use the condition ``` abs(subdiag[i]) <= epsilon * sqrt(abs(diag[i]) + abs(diag[i+1])) ``` for setting the subdiagonal entry to zero. Also adjust Wilkinson shift for small `e = subdiag[end-1]` - I couldn't find a reference for the original, and it was not consistent with the Wilkinson definition. Fixes #2191.