IF ( useMATRIX ) CALL MATRIX_INIT( myThid )
IF (useMATRIX) THEN
IF ( useMATRIX .AND. useGCHEM ) THEN
IF ( useMATRIX .AND. .NOT.usePTRACERS ) THEN
useMATRIX=.FALSE.
& useMATRIX
IF (.NOT.useMATRIX) THEN
IF (useMATRIX)
IF (useMATRIX) CALL MATRIX_READPARMS ( myThid )
LOGICAL useMATRIX
& usePP81, useMY82, useOPPS, useGGL90, useMATRIX,