Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: ISMabs: a comprehensive X-ray absorption model for the interstellar
  medium   We present an X-ray absorption model for the interstellar medium, to be
referred to as ISMabs, that takes into account both neutral and ionized species
of cosmically abundant elements, and includes the most accurate atomic data
available. Using high-resolution spectra from eight X-ray binaries obtained
with the Chandra High Energy Transmission Grating Spectrometer, we proceed to
benchmark the atomic data in the model particularly in the neon K-edge region.
Compared with previous photoabsorption models, which solely rely on neutral
species, the inclusion of ions leads to improved spectral fits. Fit parameters
comprise the column densities of abundant contributors that allow direct
estimates of the ionization states. ISMabs is provided in the appropriate
format to be implemented in widely used X-ray spectral fitting packages such as
XSPEC, ISIS and SHERPA.

11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph