The following can't be right, first rw2010: > 1 %% 0.001  0.001 Then rw2001: > 1 %% 0.001  -2.081668e-17 > and the last seems about right. -- Kjetil Halvorsen. Peace is the most effective weapon of mass construction. -- Mahdi Elmandjra -- No virus found in this outgoing message. Checked by AVG Anti-Virus.