anchor.diff:  !  Additional solver options
     iopt(1)=4         ! Set the option to change the value of TOLF
     iopt(2)=1         ! Where in ROPT to look for the new value
  -  ropt(1)=1.E-9     ! New value for TOLF
  +  ropt(1)=1.E-3     ! New value for TOLF
     iopt(3)=2         ! Change the number of interations
  -  iopt(4)=100000    ! Maximum number of iterations
  +  iopt(4)=1000      ! Maximum number of iterations
     iopt(5)=17        ! Do not allow the flag IGO to return the value IGO=3
     iopt(6)=1         ! Forces a full model step
     iopt(7)=99        ! No further options are changed
  
positive.code: !  Additional solver options
    iopt(1)=4         ! Set the option to change the value of TOLF
    iopt(2)=1         ! Where in ROPT to look for the new value
    ropt(1)=1.E-9     ! New value for TOLF
    iopt(3)=2         ! Change the number of interations
    iopt(4)=100000    ! Maximum number of iterations
    iopt(5)=17        ! Do not allow the flag IGO to return the value IGO=3
    iopt(6)=1         ! Forces a full model step
    iopt(7)=99        ! No further options are changed
  
negative.code: !  Additional solver options
    iopt(1)=4         ! Set the option to change the value of TOLF
    iopt(2)=1         ! Where in ROPT to look for the new value
    ropt(1)=1.E-3     ! New value for TOLF
    iopt(3)=2         ! Change the number of interations
    iopt(4)=1000      ! Maximum number of iterations
    iopt(5)=17        ! Do not allow the flag IGO to return the value IGO=3
    iopt(6)=1         ! Forces a full model step
    iopt(7)=99        ! No further options are changed
  