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define                = -DFLEXIBLE -DPOSRES        ; position restrain        
; Run parameters
integrator        = md                ; leap-frog integrator
nsteps                = 10000000        ; 10 ns
dt                = 0.001                ; 1 fs
; Output control
nstxout                = 5000        
nstvout                = 5000       
nstenergy        = 5000               
nstlog                = 5000               
; Bond parameters
continuation        = yes               
constraint_algorithm  = lincs        ; holonomic constraints
constraints        = h-bonds       
lincs_iter      = 1         ; accuracy of LINCS
lincs_order     = 4         ; also related to accuracy
; Neighborsearching
cutoff-scheme   = Verlet
rlist           = 1
ns_type                = grid                ; search neighboring grid cells
nstlist                = 10                ; 10 fs, largely irrelevant with Verlet
rcoulomb        = 1                ; short-range electrostatic cutoff (in nm)
rvdw                = 1                ; short-range van der Waals cutoff (in nm)
; Electrostatics
coulombtype        = PME                ; Particle Mesh Ewald for long-range electrostatics
pme_order        = 4                ; cubic interpolation
fourierspacing        = 0.12        ; grid spacing for FFT
; Temperature coupling is on
tcoupl                = v-rescale        ; modified Berendsen thermostat
tc-grps                = mmt notmmt        ; two coupling groups - more accurate
tau_t                = 2.0 2.0         ; time constant, in ps
ref_t                = 250 250             ; reference temperature, one for each group, in K
; Pressure coupling is on
pcoupl                = berendsen            ; Pressure coupling on in NPT
pcoupltype        = semiisotropic                  
tau_p                = 4.0 4.0                            ; time constant, in ps
ref_p                = 500.0 500.0                            ; reference pressure, in bar
compressibility = 0 4.5e-5                    ; isothermal compressibility of water, bar^-1
refcoord_scaling = com
; Periodic boundary conditions
pbc                = xyz                ; 3-D PBC
; Dispersion correction
DispCorr        = EnerPres        ; account for cut-off vdW scheme
; Velocity generation
gen_vel                = no                ; Velocity generation is off

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