Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Averaging of Spontaneous Radiation in Relativistic Strophotron   The main resonance frequency is shown to depend on the initial conditions of
the electron, and in particular on its initial transversal coordinate xo. This
dependence is shown to give rise to a very strong inhomogeneous broadening of
the spectral lines. The broadening can become large enough for the spectral
lines to overlap with each other. The spectral intensity of a spontaneous
emission is averaged over xo. The averaged spectral intensity is shown to have
only a very weakly expressed resonance structure.

4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an