Post-Processing Tools for GC-MS Volatile Organic Compound Data R package postvocs version 0.2.5 Provides functions for processing Shimadzu gas chromatography-mass spectrometry (GC-MS) exported text files, extracting Chemical Abstracts Service (CAS) numbers and peak areas, building abundance matrices, annotating compounds, and screening based on occurrence frequency. The package is designed for organizing, identifying, and screening volatile compounds in metabolomics and environmental studies. Software Depends: R (>= 4.5.0) Imports: dplyr, tidyr, openxlsx, readxl, rlang, webchem, tools Xiaotao Han <postvocs.r@gmail.com> Comprehensive R Archive Network (CRAN) Xiaotao Han [aut, cre] GPL (>= 3) 2026-09-12 application/tgz https://CRAN.R-project.org/package=postvocs doi:10.32614/CRAN.package.postvocs en-US