 1IND   = VARIABLES INDPENDANTES            INDEPENDENT VARIABLES
 1AGDPM   PRODUIT INTRIEUR BRUT (ORIGINE)   GROSS DOMESTIC PRODUCT AT ORIGIN
 1AGDPX   PRODUIT INTRIEUR BRUT (DESTINAT.) GROSS DOMESTIC PRODUCT AT DESTINAT.
 1DIST    DISTANCE                           DISTANCE
 3CDUMMY  DUMMY COMMERCE INTERPROVINCIAL     INTERPROVINCIAL TRADE DUMMY
 1DPMDPX  PRODUIT AGDPM*AGDPX                PRODUCT AGDPM*AGDPX
 1CONSTANTCONSTANTE DE LA RGRESSION         REGRESSION CONSTANT

  MATRICES 
  DIST_OD O et D: DIST(400 milles)           O and D: DIST(400 miles)
