LOGICAL N_edge, S_edge, E_edge, W_edge
E_edge = exch2_isEedge(myTile).EQ.1
E_edge = .TRUE.
E_edge = .FALSE.
IF ( E_edge ) iMaxUpd = sNx
IF ( .NOT.overlapOnly .OR. E_edge .OR. W_edge ) THEN
IF ( E_edge ) THEN
IF ( interiorOnly .AND. E_edge ) iMaxUpd = sNx