Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Accurate Modelling of Relativistic Iron Lines from Accretion Discs   Observations of fluorescent iron lines from accreting black holes provide one
of the best tests of strong field gravity available to date, and the only
current observational tool to probe black hole spacetime. However, the two most
widely used models for spectral fitting (diskline, laor) are over a decade old
and have significant limitations. We present a new code for calculating these
effects which will be incorporated within the XSPEC package

8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th