Observation year
1 for contiguity
1 for common official of primary language
weighted distance (pop-wt, km)
Population, total in mn
GDP (current mn US$)
GDP per cap (current in US$)
ISO2 alphanumeric
destination is current or former hegemon of origin
1 if war
Independence date if colony == 1
origin is current or former hegemon of destination
1 for trade from heg_o to colony
1 for trade from colony to heg_d
1 for pair ever in colonial relationship
1 for pair currently in colonial relationship
1 if origin is GATT/WTO member
1 if destination is GATT/WTO member
1 for regional trade agreement in force
1 for ACP to EU
GSP Dummy
1 for EU to ACP
GSP Dummy (reciprocal)
both mirror flows are valid