Document native boundary cell-area files

README.md

@@ -53,6 +53,7 @@ Each folder (e.g run1,run2...run"i" etc) corresponds to a different geometry tha
 * reference values for each geometry: geo_ref_i.csv 
 * reference geometry for each geometry: geo_parameters_i.csv 
 * Boundary VTU (~500mb): boundary_i.vtp 
+* Native boundary polygon cell areas (`m^2`, matching `boundary_i.vtp` `CellData` order): `boundary_cell_area_i.npy`
 * Volume field VTU (~50GB): volume_i.vtu ( please note on HuggingFace this is split into part 1 and part2 - please cat them together to create the volume_i.vtu)
 * forces/moments time-averaged (using varying frontal area/wheelbase): force_mom_i.csv 
 * forces/moments time-averaged (using constant frontal area/wheelbase): force_mom_constref_i.csv 
@@ -177,6 +178,7 @@ This dataset is provided under the CC BY SA 4.0 license, please see LICENSE.txt
 
 version history:
 ---------------
+* 17/08/2026 - Added per-run native boundary polygon cell-area arrays and supporting metadata in `surface_cell_areas/`.
 * 17/08/2026 - Added deterministic official train/validation/test splits, including data-efficiency and out-of-distribution evaluation protocols.
 
 * 04/03/2025 - Now available on HuggingFace!