Fragmentation Spectra Analysis (FSA) R package IDSL.FSA version 1.2 The 'IDSL.FSA' package was designed to annotate standard .msp (mass spectra format) and .mgf (Mascot generic format) files using mass spectral entropy similarity, dot product (cosine) similarity, and normalized Euclidean mass error (NEME) followed by intelligent pre-filtering steps for rapid spectra searches. 'IDSL.FSA' also provides a number of modules to convert and manipulate .msp and .mgf files. The 'IDSL.FSA' workflow was integrated in the 'IDSL.CSA' and 'IDSL.NPA' packages introduced in <doi:10.1021/acs.analchem.3c00376>. Software Depends: R (>= 4.0) Suggests: readxl Dinesh Barupal <dinesh.barupal@mssm.edu> Comprehensive R Archive Network (CRAN) Sadjad Fakouri-Baygi [aut] (ORCID: <https://orcid.org/0000-0002-6864-6911>), Dinesh Barupal [cre, aut] (ORCID: <https://orcid.org/0000-0002-9954-8628>) MIT + file LICENSE (https://CRAN.R-project.org/package=IDSL.FSA/LICENSE) 2023-06-29 application/tgz https://CRAN.R-project.org/package=IDSL.FSA doi:10.32614/CRAN.package.IDSL.FSA