Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Using Rigorous Ray Tracing to Incorporate Reflection into the Parabolic
  Approximation   We present a parabolic approximation that incorporates reflection. With this
approximation, there is no need to solve the parabolic equation for a coupled
pair of solutions consisting of the incident and reflected waves. Rather, this
approximation uses a synthetic wave whose spectral components manifest the
incident and reflected waves.

8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ