Occlusion Surface Using the Occluded Surface and Fibonacci Occluded Surface R package fibos version 2.0.1 The Occluded Surface (OS) algorithm is a widely used approach for analyzing atomic packing in biomolecules as described by Pattabiraman N, Ward KB, Fleming PJ (1995) <doi:10.1002/jmr.300080603>. Here, we introduce 'fibos', an 'R' and 'Python' package that extends the 'OS' methodology, as presented in Soares HHM, Romanelli JPR, Fleming PJ, da Silveira CH (2024) <doi:10.1101/2024.11.01.621530>. Software Depends: R (>= 4.1.0) Imports: fs, dplyr, readr, stringr, tidyr, reticulate, glue Herson Soares <hersonhebert@hotmail.com> Comprehensive R Archive Network (CRAN) Herson Soares [cre, aut], Carlos Silveira [aut], João Romanelli [aut], Patrick Fleming [aut], Posit Software, PBC [cph, fnd] GPL-3 2025-06-04 application/tgz https://CRAN.R-project.org/package=fibos doi:10.32614/CRAN.package.fibos