 Test of constant pH in GB on HEWL
 &cntrl                                                                        
   ig=49,
   nstlim =2500000
   cut=30.0, scee=1.2, igb=2, saltcon=0.1,
   ntx=1, irest=0, ntb=0, ntpr=500,
   dt=0.002, nrespa=1,
   ntt=1, tempi=300.0, temp0 = 300., tautp=2.0,
   ntc=2, ntf=2, tol=0.000001,
   ntwr =500, ntwx=500, rgbmax=30.0
   icnstph=1, ntcnstph=1, solvph=3.0
/
