x: DISTANCE ATOMS=1,20
y: DISTANCE ATOMS=15,25

COMMITTOR ...
ARG=x,y
BASIN_LL1=0.6,0.2
BASIN_UL1=0.7,0.4
BASIN_LL2=0.7,0.2
BASIN_UL2=0.8,0.4
BASIN_LL3=0.8,0.2
BASIN_UL3=0.9,0.4
FILE=COMMITED
NOSTOP
... COMMITTOR

PRINT ARG=x,y FILE=COLVAR STRIDE=1

ENDPLUMED
