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@@ -119,18 +119,37 @@ with h5py.File("ball3d/ball3d_test.h5", "r") as f:
 Euler trajectories live under per-trajectory groups inside the file; iterate
 keys to enumerate.
 
-## Reproducing splits
+## Split sizes
+
+| split    | Oregonator | Euler 2D | Ball 3D |
+|----------|-----------:|---------:|--------:|
+| train    | 1 200      | 800      | 1 000   |
+| val      | 150        | 100      | 200     |
+| test     | 150        | 100      | 200     |
+| ood_near | 250        | 200      | 200     |
+| ood_far  | 250        | 200      | 200     |
 
-Each split is defined by a base seed offset (see `dataset_config.json`) so
-splits don't share initial conditions and can be regenerated bit-for-bit:
+(Counts are number of independent trajectories. Each trajectory holds 100-201
+saved frames depending on the environment.)
+
+## Reproducing splits
 
-| split    | seed offset |
-|----------|------------:|
-| train    | 0           |
-| val      | 100 000     |
-| test     | 200 000     |
-| ood_near | 300 000     |
-| ood_far  | 400 000     |
+Splits do not share initial conditions: each split is generated from a
+disjoint range of integer seeds. The seed _offset_ below is the first seed
+used for that split; consecutive trajectories use offset, offset+1, offset+2,
+... — so train uses seeds 0 through 1 199, val uses 100 000 through 100 149,
+etc. This guarantees a regenerable, leak-free split assignment.
+
+| split    | seed offset | seed range (Oregonator)  |
+|----------|------------:|-------------------------:|
+| train    | 0           | 0 ... 1 199              |
+| val      | 100 000     | 100 000 ... 100 149      |
+| test     | 200 000     | 200 000 ... 200 149      |
+| ood_near | 300 000     | 300 000 ... 300 249      |
+| ood_far  | 400 000     | 400 000 ... 400 249      |
+
+See `oregonator/dataset_config.json` for full per-env metadata
+(grid sizes, integration step, physics parameters, IC mixture).
 
 ## Intended use