Complex eigenvalues analysis (sol107)

[adamas]

I'm using sol 107 to extract the eigenvalues and eigenvectors of a FE model including damping.
Among the methods available I've chosen complex Lanczos but I don't understand if the parameters SHIFTRj and SHIFTIj, which according to the manual are the real and imaginary part of the shift point, and NDj, desired number of eigenvalue to extract from the shift point, are required and what values should I use.

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EIGC SID METHOD EPS ND0
Continuation Line Format for Complex Lanczos Methods:
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SHIFTRj SHIFTIj MBLKSZj IBLKSZj KSTEPSj NDj

Anyone has experience with that?

Thank you