double precision  gcart, gxcart, gradcag,gradxag
      common /mdgrad/ gcart(3,0:MAXRES), gxcart(3,0:MAXRES),
     & gradcag(3,MAXRES),gradxag(3,MAXRES)
       integer dimen,dimen1, dimen3, ifrag(2,50,maxprocs/20), 
     &                       ipair(2,100,maxprocs/20),iset,
     &                       mset(maxprocs/20),nset
       double precision IP,ISC(ntyp+1),mp,
     & msc(ntyp+1),
     & eq_time,wfrag(50,maxprocs/20),wpair(100,maxprocs/20),
     & qfrag(50),qpair(100),
     & qinfrag(50,maxprocs/20),qinpair(100,maxprocs/20),
     & Ucdfrag,Ucdpair,dUdconst(3,0:MAXRES),Uconst,
     & dUdxconst(3,0:MAXRES),dqwol(3,0:MAXRES),dxqwol(3,0:MAXRES),
     & utheta(maxfrag_back),ugamma(maxfrag_back),uscdiff(maxfrag_back),
     & dutheta(maxres),dugamma(maxres),duscdiff(3,maxres),
     & duscdiffx(3,maxres),wfrag_back(3,maxfrag_back,maxprocs/20),
     & uconst_back
      integer 
     & nfrag,npair,nfrag_back,
     & ifrag_back(3,maxfrag_back,maxprocs/20)
      integer nresn,nyosh,nnos
      logical large,print_compon
      common /back_constr/ uconst_back,utheta,ugamma,uscdiff,
     & dutheta,dugamma,duscdiff,duscdiffx,
     & wfrag_back,nfrag_back,ifrag_back
      common /qmeas/ qfrag,qpair,qinfrag,qinpair,wfrag,wpair,eq_time,
     & Ucdfrag,Ucdpair,dUdconst,dUdxconst,dqwol,dxqwol,Uconst,
     & iset,mset,nset,usampl,ifrag,ipair,npair,nfrag
      common /mdpmpi/ igmult_start,igmult_end,my_ng_count,
     & myginv_ng_count,
     & ng_start(0:MaxProcs-1),ng_counts(0:MaxProcs-1),
     & nginv_start(0:MaxProcs),nginv_counts(0:MaxProcs-1)
      double precision pi_np,pistar,s_np,s12_np,Q_np,E_old,H0,E_long,
     & sold_np,d_t_half,Csplit,hhh
      common /nosepoincare/ pi_np,pistar,s_np,s12_np,Q_np,E_old,H0,
     & E_long,sold_np,d_t_half(3,0:MAXRES2),Csplit,hhh
      common /nosehoover/ glogs(maxmnh),qmass(maxmnh),
     &                    vlogs(maxmnh),xlogs(maxmnh),
     &                    nresn,nyosh,nnos,xiresp
      double precision pstok,restok(ntyp+1),cPoise,Rb
      common /langevin/ pstok,restok
      double precision t_bath
      common /mdpar/ t_bath