Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: In-orbit calibration of vignetting in XMM-Newton EPIC   We briefly describe the in orbit measurements of the mirror vignetting, using
observations of SNR G21.5-09. The instrument features which complicate these
measurements are briefly described, and we show the spatial and energy
dependences, outlining assumptions made in deriving the eventual agreement
between theory and measurement.

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The categories of this paper are: hep-ph
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The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs