Karow, Michael2017-12-142017-12-142011-12-080895-4798https://depositonce.tu-berlin.de/handle/11303/7273http://dx.doi.org/10.14279/depositonce-6546In this paper we study the shape and growth of structured pseudospectra for small matrix perturbations of the form $A \leadsto A_\Delta=A+B\Delta C$, $\Delta \in \boldsymbol{\Delta}$, $\|\Delta\|\leq \delta$. It is shown that the properly scaled pseudospectra components converge to nontrivial limit sets as $\delta$ tends to 0. We discuss the relationship of these limit sets with $\mu$-values and structured eigenvalue condition numbers for multiple eigenvalues.en518 Numerische Analysis512 Algebraeigenvaluesperturbationsspectral value sets$\mu$-valuescondition numbersArticle1095-7162