Resolvent contours: The Resolvent matrix is = ( ) − The diagrams below show the Resolvent contours / -pseudospectrum ( () ) close to the origin of a low resolution Eigen spectrum. The contours are of the followi ng form: () = { ∈ ∶ () ≤ } The contours in the diagram below represent = 1, 10 − , 10 −2 , 10 −3