[petsc-dev] What is the difference between shift and target in SLEPc ?

[Franck Houssen]

What is the difference between shift and target in SLEPc ? Shift (STSetShift) is clear to me, but, target (EPSSetTarget) is not. 
Can somebody give an example where one want/need to have a target which would be different from the shift ? 

Franck 
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