Studying weak inter­actions in crystals at high pressures: when hardware matters

The quality of structural models for 1,2,4,5-tetra­bromo­benzene (TBB), C6H2Br4, based on data collected from a single crystal in a diamond anvil cell at 0.4 GPa in situ using two different diffractometers belonging to different generations have been compared, together with the effects of applying different data-processing strategies.