Add normalization parameters to documentation

docs/specification.md

@@ -112,6 +112,26 @@ We store each chip as geotiff, along with their coordinate & timestamp informati
 
 ![bands](https://github.com/Clay-foundation/model/assets/23487320/85fbc8d2-28f6-4021-855b-c1eb84dd09e3)
 
+### Normalization parameters
+
+To normalize the data before passing it to the model, we computed the following normalization parameters from a random sample of the the training data. The normalization parameters are used in the [Data Module](https://github.com/Clay-foundation/model/blob/main/src/datamodule.py#L108), for partial
+inputs it will be necessary to subset these as shown in the partial input tutorial.
+
+| Band |  Mean    | Standard deviation |
+| -----|----------|--------------------|
+| B02  |  1369.03 | 2026.96            |
+| B03  |  1597.68 | 2011.88            |
+| B04  |  1741.10 | 2146.35            |
+| B05  |  2053.58 | 2138.96            |
+| B06  |  2569.82 | 2003.27            |
+| B07  |  2763.01 | 1962.45            |
+| B08  |  2858.43 | 2016.38            |
+| B8A  |  2893.86 | 1917.12            |
+| B11  |  2303.00 | 1679.88            |
+| B12  |  1807.79 | 1568.06            |
+| VV   |  0.026   | 0.118              |
+| VH   |  0.118   | 0.873              |
+| DEM  |  499.46  | 880.35             |
 
 ## Training Card