Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ionization balance for optically thin plasmas: rate coefficients for all
  atoms and ions of the elements H to Ni   We present in this paper new and updated calculations of the ionization
equilibrium for all the elements from H to Ni. We collected for these elements
all the data available in the literature for the ionization and radiative plus
dielectronic recombination rates. In particular, the dielectronic rates have
been fitted with a single formula and the related coefficients are tabulated.
Our results are compared with previous works.

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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: physics
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: solv-int