Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intermediate Velocity Clouds - Distances, Infall and Shadowing   We present the current distance estimates to 11 intermediate velocity clouds
(IVCs) which are part of the David Dunlap Observatory Intermediate Velocity
Cloud (DDO IVC) Distance Project (Clarke et al. 1999). We briefly discuss
constraints these place on infall models and show the potential of IVCs to
constrain the radial distribution of hot gas in the Galaxy through shadowing of
the soft X-ray background.

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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex