subroutine contact(lprint,ncont,icont)
      include 'DIMENSIONS'
      include 'COMMON.IOUNITS'
      include 'COMMON.CHAIN'
      include 'COMMON.INTERACT'
      include 'COMMON.FFIELD'
      include 'COMMON.NAMES'
      real*8 facont /1.569D0/  ! facont = (2/(1-sqrt(1-1/4)))**(1/6)
      integer ncont,icont(2,maxcont)
      logical lprint
      ncont=0
      kkk=3
c     print *,'nnt=',nnt,' nct=',nct
      do i=nnt+kkk,nct
        iti=itype(i)
        do j=nnt,i-kkk
          itj=itype(j)
          if (ipot.ne.4) then
c           rcomp=sigmaii(iti,itj)+1.0D0
            rcomp=facont*sigmaii(iti,itj)
          else 
c           rcomp=sigma(iti,itj)+1.0D0
            rcomp=facont*sigma(iti,itj)
          endif
c         rcomp=6.5D0
c         print *,'rcomp=',rcomp,' dist=',dist(nres+i,nres+j)
	  if (dist(nres+i,nres+j).lt.rcomp) then
            ncont=ncont+1
            icont(1,ncont)=i
            icont(2,ncont)=j
          endif
        enddo
      enddo
      if (lprint) then
        write (iout,'(a)') 'Contact map:'
        do i=1,ncont
          i1=icont(1,i)
          i2=icont(2,i)
          it1=itype(i1)
          it2=itype(i2)
          write (iout,'(i3,2x,a,i4,2x,a,i4)') 
     &     i,restyp(it1),i1,restyp(it2),i2 
        enddo
      endif
      return
      end
c----------------------------------------------------------------------------
      double precision function contact_fract(ncont,ncont_ref,
     &                                     icont,icont_ref)
      include 'DIMENSIONS'
      include 'COMMON.IOUNITS'
      integer ncont,ncont_ref,icont(2,maxcont),icont_ref(2,maxcont)
      nmatch=0
c     print *,'ncont=',ncont,' ncont_ref=',ncont_ref 
c     write (iout,'(20i4)') (icont_ref(1,i),i=1,ncont_ref)
c     write (iout,'(20i4)') (icont_ref(2,i),i=1,ncont_ref)
c     write (iout,'(20i4)') (icont(1,i),i=1,ncont)
c     write (iout,'(20i4)') (icont(2,i),i=1,ncont)
      do i=1,ncont
        do j=1,ncont_ref
          if (icont(1,i).eq.icont_ref(1,j) .and. 
     &        icont(2,i).eq.icont_ref(2,j)) nmatch=nmatch+1
        enddo
      enddo
c     print *,' nmatch=',nmatch
c     contact_fract=dfloat(nmatch)/dfloat(max0(ncont,ncont_ref))
      contact_fract=dfloat(nmatch)/dfloat(ncont_ref)
      return
      end