Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: SparsePak Observations of Diffuse Ionized Gas Halo Kinematics in NGC 891   We present WIYN SparsePak observations of the diffuse ionized gas (DIG) halo
of NGC 891. Preliminary results of an analysis of the halo velocity field
reveal a clear gradient of the azimuthal velocity with z which agrees with
results for the neutral gas. The magnitude of the gradient has been determined,
using two independent methods, to be approximately 15 km/s/kpc.

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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ph
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The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: nucl-ex
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The categories of this paper are: cond-mat