$CONTRL SCFTYP=RHF MAXIT=200 RUNTYP=OPTIMIZE
         COORD=ZMT MULT=1 
         ICHARG=0  
         DFTTYP=B3LYP
         MOLPLT=.FALSE. PLTORB=.FALSE.  $END
 $SYSTEM TIMLIM=2879 MWORDS=250  $END

 $STATPT OPTTOL=0.0005 NSTEP=999 IHREP=0 $END

 $BASIS  GBASIS=N31 NGAUSS=6
         NDFUNC=1   NPFUNC=0  NFFUNC=0  $END

 $SCF    DIRSCF=.T. $END
 $GUESS  GUESS=HUCKEL  $END

 $DATA
Ethane Molecule
C1
C
C       1        CC_DIST
F       1        CH_DIST     2         HCC_ANGLE
H       1        CH_DIST     2         HCC_ANGLE    3     TORS1
H       1        CH_DIST     2         HCC_ANGLE    4     TORS2
F       2        CH_DIST     1         HCC_ANGLE    3     TORS3
H       2        CH_DIST     1         HCC_ANGLE    4     TORS3
H       2        CH_DIST     1         HCC_ANGLE    5     TORS3

CC_DIST     = 1.51050
CH_DIST     = 1.09376
HCC_ANGLE   = 109.4712
TORS1  = -120.0000
TORS2  = -120.0000
TORS3  =   !changeme
$END