The gziped files of this directory are for year 2008
corresponding to 61 products and 227 countries: 

-productnames.txt has all product code names
 from Table 1 of the paper

-balance.txt
has the balance of each country
(using 2 ISO code)
http://en.wikipedia.org/wiki/ISO_3166-2

-balanceVol.txt is the same but computed with
volume ImportRank and ExportRank

-derivbalance.country.prod.XX.txt
are the derivative balance of countries
with respect to product XX
(derivbalanceVol.country.prod.XX.txt
  correspond to volume cases).

- derivbalance.cp.XX.txt
have all derivative of balance c=XX and p (in 2nd col)
with respect to product p^\prime (1st col)
(they are explained in the first line of the files).
derivbalanceVol.cp.XX.txt correspond to volume cases

there are also files of rank indexes for year 2008
given also in the main web page
( KK*.txt and KK*.html)
