number_density Hierarchy

System: HEP

flowchart LR
    hep_number_density["<b><a href="../../systems/hep/#number_density" style="color: var(--md-mermaid-label-fg-color); text-decoration: none;">hep::number_density</a></b><br><i>(inverse(<a href="../../systems/hep/#volume" style="color: var(--md-mermaid-label-fg-color); text-decoration: none;">volume</a>))</i>"]