Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental investigation of Wigner's reaction matrix for irregular
  graphs with absorption   We use tetrahedral microwave networks consisting of coaxial cables and
attenuators connected by T-joints to make an experimental study of Wigner's
reaction K matrix for irregular graphs in the presence of absorption. From
measurements of the scattering matrix S for each realization of the microwave
network we obtain distributions of the imaginary and real parts of K. Our
experimental results are in good agreement with theoretical predictions.

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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
2
The categories of this paper are: math
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The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg