diff --git a/README.md b/README.md
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+---
+license: cc-by-4.0
+pretty_name: ECG age
+tags:
+- ecg
+- electrocardiography
+- physiological-signals
+size_categories:
+- 1K<n<10K
+---
+
+# ecg-age
+
+Twelve lead resting electrocardiograms with the age of the person they were recorded from, drawn from
+PTB-XL and repackaged one record per file.
+
+Every record is ten seconds at 500 Hz. Each `.npz` holds exactly three arrays and nothing else:
+
+- `signal`, float32 of shape `(12, 5000)`, the lead voltages in millivolts
+- `fs`, int64, the sampling rate, always 500
+- `lead_names`, the twelve leads in order: I, II, III, aVR, aVL, aVF, V1, V2, V3, V4, V5, V6
+
+No other field of the source database travels with the signals. There is no sex, no diagnostic
+statement, no device, no recording date and no PTB-XL identifier in any file.
+
+## Layout
+
+```
+data/heldout/rec-0000.npz .. rec-2009.npz   2010 records, ages withheld
+data/train/train-0000.npz .. train-5999.npz 6000 records
+data/train/ages.csv                         id,age in whole years for data/train only
+```
+
+**Ages are withheld for `data/heldout`.** No age file is published for that folder, here or anywhere
+else. The 2010 held out records are drawn with a flat age distribution, 134 records in each five year
+band from 18 to 89, so the young are as numerous as the old. The 6000 training records keep the
+natural age distribution of the source database. One record per person throughout, and no person
+appears in both folders.
+
+## Source and licence
+
+Derived from PTB-XL version 1.0.3, a clinical twelve lead ECG database of 21799 records from 18869
+patients, released on PhysioNet under Creative Commons Attribution 4.0. This repackaging is released
+under the same licence. Records were taken from the 500 Hz `records500` signals, one record per
+patient, restricted to ages 18 to 89.
+
+Please cite all three of the following, as PTB-XL asks.
+
+Wagner P, Strodthoff N, Bousseljot RD, Kreiseler D, Lunze FI, Samek W, Schaeffter T. PTB-XL, a large
+publicly available electrocardiography dataset. Scientific Data 7:154 (2020).
+https://doi.org/10.1038/s41597-020-0495-6
+
+Goldberger AL, Amaral LAN, Glass L, Hausdorff JM, Ivanov PC, Mark RG, Mietus JE, Moody GB, Peng CK,
+Stanley HE. PhysioBank, PhysioToolkit, and PhysioNet: Components of a New Research Resource for
+Complex Physiologic Signals. Circulation 101(23):e215-e220 (2000).
+
+Wagner P, Strodthoff N, Bousseljot RD, Samek W, Schaeffter T. PTB-XL, a large publicly available
+electrocardiography dataset (version 1.0.3). PhysioNet (2022). https://doi.org/10.13026/kfzx-aw45
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