c1: COORDINATIONNUMBER SPECIESA=1,2,3 SPECIESB=4-100 SWITCH={RATIONAL R_0=0.5} MEAN
c2: COORDINATIONNUMBER SPECIESA=1,2,3 SPECIESB=4-100 SWITCH={RATIONAL R_0=0.7} 
cc: MCOLV_PRODUCT DATA=c1,c2 MEAN LOWMEM
DUMPMULTICOLVAR DATA=cc FILE=cc.xyz PRECISION=4
DUMPDERIVATIVES ARG=cc.mean FILE=deriv FMT=%8.4f
RESTRAINT ARG=cc.mean KAPPA=10 AT=1.0 
