The dist_cepii.xls file provides the bilateral data: The different distance
measures (dist, distcap, distw, distwces) (internal distances included),
and dummy variables indicating wheter the two countries are contiguous (contig),
share a common language, have had a common colonizer after 1945(comcol),
have ever had a colonial link (colony), have had a colonial relationship after
1945 (col45), are currently in a colonial relationship (curcol)
11 or were/are the
same country (smctry)
12