LOGICAL N_edge, S_edge, E_edge, W_edge
N_edge = exch2_isNedge(myTile).EQ.1
N_edge = .TRUE.
N_edge = .FALSE.
IF ( .NOT.overlapOnly .OR. N_edge .OR. S_edge ) THEN
IF ( N_edge ) THEN
IF ( interiorOnly .AND. N_edge ) jMaxUpd = sNy
IF ( N_edge ) jMaxUpd = sNy