Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: TLUSTY and SYNSPEC Users's Guide IV: Upgraded Versions 208 and 54   We present a brief description of the newly upgraded versions of the programs
TLUSTY, version 208, and SYNSPEC, version 54. TLUSTY is used to generate model
stellar atmospheres or accretion disks, and SYNSPEC produces detailed synthetic
spectra and/or opacity tables. This paper complements published guides that
provide a detailed description of earlier versions of the codes, TLUSTY205, and
SYNSPEC51. The main upgrades include the flexible construction of opacity
tables in SYNSPEC, and their use in producing hybrid models with TLUSTY}, with
important species treated in NLTE, while the bulk of opacity of atomic and
molecular lines and continua are considered in LTE using a pre-calculated
opacity table. There is also a number of additional changes and upgrades that
increase the versatility and flexibility of these codes.

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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
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The categories of this paper are: q-bio
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The categories of this paper are: math
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph