text metrics description

README.md

@@ -970,9 +970,16 @@ For a detailed description of this dataset please refer to https://hplt-project.
 This is the ```cleaned``` variant of the HPLT Datasets v2.0 converted to the Parquet format semi-automatically when being uploaded here. For the original jsonl distribution (which takes ~4x fewer disk space) and a larger non-cleaned version please refer to https://hplt-project.org/datasets/v2.0.
 
 ***Languages***
+The ```cleaned``` version of HPLT Datasets v2.0 consists of subsets corresponding to 191 language codes. 
+Below we provide a list of language codes. For each language code the amount of text is shown as measured in:
+- segments: the number of sequences of characters (possibly empty) separated by the newline symbol,
+- wcwords: the number of words as defined by the Unix ```wc``` utility, i.e. the number of non-whitespaces with a whitespace or the beginning of document before,
+- chars: the number of characters,
+- docs: the number of documents, each document corresponds to an individual web page from the sourcing web crawls.
+
 |     | lang     | segments | wcwords  | chars    | docs     | Language Name                 | ISO693-3 code | ISO693-3 code macro | ISO693-1 direct code | ISO693-1 through macro |
 |-----|----------|----------|----------|----------|----------|-------------------------------|---------------|---------------------|----------------------|------------------------|
-| 0   | TOTAL    | 3.00e+11 | 5.56e+12 | 3.74e+13 | 1.06e+10 |                               |               |                     |                      |                        |
+| 0   | *TOTAL*   | 3.00e+11 | 5.56e+12 | 3.74e+13 | 1.06e+10 |                               |               |                     |                      |                        |
 | 1   | ace_Arab | 1.17e+02 | 8.36e+03 | 4.97e+04 | 1.60e+01 | Achinese                      | ace           |                     |                      |                        |
 | 2   | ace_Latn | 2.06e+05 | 8.20e+06 | 5.08e+07 | 1.29e+04 | Achinese                      | ace           |                     |                      |                        |
 | 3   | afr_Latn | 3.77e+07 | 1.00e+09 | 5.95e+09 | 1.46e+06 | Afrikaans                     | afr           |                     | af                   | af                     |