anchor.diff:  contains
   
     !----------------------------------------------------------!
  -  ! FUNCTION FLATFILTER                                      !
  +  ! FUNCTION SLANTINGFILTER                                  !
     !                                                          !
     ! This function tests if the point for which the values fx !
     ! (objective function value) and hxnorm (norm of the       !
  
positive.code: module filters
  
    abstract interface
       function absfilter(fx,hxnorm,alpha_,nf,ffilter,hfilter)
  
negative.code: 
      ! LOCAL SCALARS
      integer :: i
  
      slantingFilter = .false.
  
  