c  -- I/O units
      integer :: inp = 1
      integer :: ow = 3
      integer :: opopsum = 4
      integer :: pdb = 5
      integer :: olog = 6
      integer :: iwham = 7
      integer :: owham = 8
      integer :: imremd = 9
      integer :: omremd = 10
      integer :: izscore = 11
      integer :: ozscore = 12
      integer :: iscript = 13
      integer :: oscript = 14
      integer :: ostate = 15
      integer :: izsoptw = 16                           ! zscore optimized weights files 
      integer :: izenergy = 17
      integer :: iobank = 18
      integer :: obankh = 19                            ! csa bank history file 

c  -- I/O filenames 
      character*20 :: owfn = "weights"       
      character*20 :: inpfn = "unresga.inp"  		! Main input file 
      character*20 :: ologfn = "unresga.log" 		! Log
c      character*20 :: iwhamfn = "wham.tpl"  		! wham input template file
      character*20 :: owhamfn = "wham.inp"		! wham input file
c      character*20 :: imremdfn = "mremd.tpl"		! mremd input template file
      character*20 :: omremdfn = "mremd.inp"   		! mremd input file
      character*20 :: izscorefn = "zscore.tpl" 		! zscore input template file
      character*20 :: ozscorefn = "zscore.inp" 		! zscore input file 
      character*20 :: opopsumfn = "population.summary"
      character*20 :: ostatefn = "unresga.state"	! unresga state file
      character*20 :: izenergyfn = "zscore.out_par"     ! zscore generated output prefix
      character*20 :: iobankfn = "unresga.bank"         ! csa current bank file
      character*20 :: obankhfn = "unresga.bank.history" ! csa bank history file