d: DISTANCE ATOMS=1,10
c: COORDINATION GROUPA=1-108 GROUPB=1-108 R_0=0.5

fg: METAD ARG=c,d SIGMA=0.1,0.2 HEIGHT=5.0 PACE=1 FMT=%14.6f WALKERS_MPI FILE=HILLS_multi FLYING_GAUSSIAN RESTART=YES

PRINT ARG=fg.bias FILE=colvar

