 test of PB reaction field on protein g solvated in a sphere (iAPBS)
&cntrl 
   ntx=1, irest=0,
   imin=1, ntmin=2, maxcyc=0,
   ntpr=1, igb=6, ntb=0,
   ntc=1, ntf=1, tol=0.000001,
 /   
&apbs
    apbs_debug=0, apbs_print=1,
    grid = 0.5, 0.5, 0.5,
    calc_type=0,     cmeth=1,
 bcfl=2, srfm=0,
 chgm=0, srad =1.4, swin =0.3,
 pdie=1.0,  sdie=80.0,
 calcforce=0,
 radiopt=3, pqr='pgb-amber.pqr',
&end
