dx: XANGLES ATOMS1=1,2 ATOMS2=5,4 LESS_THAN={RATIONAL R_0=1.5} 
#dxn: XANGLES ATOMS1=1,2 ATOMS2=5,4 LESS_THAN={RATIONAL R_0=1.5} NUMERICAL_DERIVATIVES
dy: ZYTORSIONS ATOMS1=1,2 ATOMS2=5,4 BETWEEN={GAUSSIAN LOWER=-3 UPPER=1.5 SMEAR=0.5}
#dyn: ZYTORSIONS ATOMS1=1,2 ATOMS2=5,4 BETWEEN={GAUSSIAN LOWER=-3 UPPER=1.5 SMEAR=0.5} NUMERICAL_DERIVATIVES
PRINT ARG=dx.*,dy.* FILE=colvar FMT=%8.4f
DUMPDERIVATIVES ARG=dx.*,dy.* FILE=deriv FMT=%8.4f

