Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Energy Spectrum of Telescope Array's Middle Drum Detector and the
  Direct Comparison to the High Resolution Fly's Eye Experiment   The Telescope Array's Middle Drum fluorescence detector was instrumented with
telescopes refurbished from the High Resolution Fly's Eye's HiRes-1 site. The
data observed by Middle Drum in monocular mode was analyzed via the HiRes-1
profile-constrained geometry reconstruction technique and utilized the same
calibration techniques enabling a direct comparison of the energy spectra and
energy scales between the two experiments. The spectrum measured using the
Middle Drum telescopes is based on a three-year exposure collected between
December 16, 2007 and December 16, 2010. The calculated difference between the
spectrum of the Middle Drum observations and the published spectrum obtained by
the data collected by the HiRes-1 site allows the HiRes-1 energy scale to be
transferred to Middle Drum. The HiRes energy scale is applied to the entire
Telescope Array by making a comparison between Middle Drum monocular events and
hybrid events that triggered both Middle Drum and the Telescope Array's
scintillator Ground Array.

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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: nucl-ex
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The categories of this paper are: physics
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The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ph
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: q-bio
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol