Here the ntupla and the file containing it are simply closed invoking the recommended HBOOK routines.
*$ CREATE USROUT.FOR
*COPY USROUT
*
*=== usrout ===========================================================*
*
SUBROUTINE USROUT ( WHAT, SDUM )
INCLUDE '(DBLPRC)'
INCLUDE '(DIMPAR)'
INCLUDE '(IOUNIT)'
*
DIMENSION WHAT (6)
CHARACTER SDUM*8
*
ITSAV = ITEXPI
CALL HROUT(0,ICYCLE,' ')
CALL HREND('Muons')
NLUNI1 = 63
CLOSE(NLUNI1)
ITEXPI = ITSAV
RETURN
END