42INTEGER :: s_ixint_2 !< 2nd dimension of IXINT array
43INTEGER, DIMENSION(:,:), ALLOCATABLE :: ixint !< "pseudo element" for interface (a segment + a secondary node)
44INTEGER, DIMENSION(:), ALLOCATABLE :: address !< address array, dimension=ninter+1 (x) : adress of the first pair, (x+1)-(x) = number of pair for the interface x