This is TeX, Version 3.14159 (Web2C 7.3.1) (format=latex 1999.9.25)  29 MAY 2002 09:30
**NIM_spect_v35.tex
(NIM_spect_v35.tex
LaTeX2e <1998/12/01> patch level 1
Babel <v3.6x> and hyphenation patterns for american, french, german, ngerman, i
talian, nohyphenation, loaded.

! LaTeX Error: File `elsart.cls' not found.

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or enter new name. (Default extension: cls)

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l.2 \usepackage
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Here is how much of TeX's memory you used:
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