Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multifrequency Method for Mapping Active Galactic Nuclei with Allowance
  for the Frequency-Dependent Image Shift   We consider the problem of multifrequency VLBA image synthesis and
spectral-index mapping for active galactic nuclei related to the necessity of
taking into account the frequency-dependent image shift. We describe our
generalized multifrequency synthesis algorithm with a spectral correction based
on the maximum entropy method. The results of our processing of multifrequency
VLBI data for the radio sources J2202+4216, J0336+3218, and J1419+5423 are
presented.

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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con