AtlasStyle

atlasstyle is a ROOT-based plotting style used by the ATLAS Collaboration to produce publication-quality plots that conform to ATLAS branding and typography guidelines. It includes a predefined set of style configurations and a small collection of helper macros to standardize how histograms, graphs, and canvases appear across analyses.

The package commonly includes files such as AtlasStyle.C and AtlasLabels.C. It defines margins, axis label formatting, color choices, and a distinctive ATLAS label that can be drawn on plots. The goal is to ensure consistency across internal analyses and external publications, making plots clear and readable in both print and on screen.

Originating within the ATLAS software and publications groups, atlasstyle has grown into a widely used plotting standard within ATLAS and is sometimes shared with collaborators outside the experiment. While tailored for ATLAS plots, it has also been of interest to other projects seeking a similar, publication-ready aesthetic.

Usage in a typical ROOT workflow involves loading the atlasstyle macros and applying the style to the current session, after which canvases and histograms can be created as usual. The style provides sensible defaults for margins, fonts, and label placements, while preserving the overall ATLAS look. Users can adjust certain parameters if needed, but the aim remains consistency and readability.

Maintenance and compatibility are ongoing considerations, as ROOT evolves and branding guidelines are updated. AtlasStyle is maintained to stay compatible with newer ROOT versions and is distributed as part of ATLAS software releases or available in public repositories, allowing analysts to adopt or adapt the style for their plots.