ANGLES ...
 GROUPA=1 GROUPB=2-100 
 SWITCH={RATIONAL R_0=1.0} MEAN LABEL=a1
... ANGLES

ANGLES ...
 GROUPA=1 GROUPB=2-100
 SWITCH={RATIONAL R_0=1.0}
 MEAN
 LESS_THAN={GAUSSIAN R_0=0.5pi}
 MORE_THAN={GAUSSIAN R_0=0.5pi}
 BETWEEN1={GAUSSIAN LOWER=0.25pi UPPER=0.75pi NORM}
 BETWEEN2={GAUSSIAN LOWER=0.25pi UPPER=0.75pi}
 TOL=0.001
 LABEL=a2
... ANGLES

PRINT ARG=a1.*,a2.* FILE=colvar FMT=%8.5f
DUMPDERIVATIVES ARG=a2.* FILE=derivatives FMT=%8.5f
