&rst iat(1)=5, !select four atoms for a torsional restraint iat(2)=7, iat(3)=9, iat(4)=15, r1=-20.0 !between r1 and r2 the restraint weakens r2=0.0, !between r2 and r3 there is no restraint r3=120.0, !between r3 and r4 the restraint returns r4=140.0, rk2=40.0, !spring constants rk3=40.0 / &rst iat(1)=7, !select four atoms for a torsional restraint iat(2)=9, iat(3)=15, iat(4)=17, r1=-20.0 !between r1 and r2 the restraint weakens r2=0.0, !between r2 and r3 there is no restraint r3=120.0, !between r3 and r4 the restraint returns r4=140.0, rk2=40.0, !spring constants rk3=40.0 /