keys.add("optional","EPSILON","(default=-1) the maximum distance between the close and the current structure, the positive value turn on the close structure method");
keys.add("optional","LOG-CLOSE","(default=0) value 1 enables logging regarding the close structure");
keys.add("optional","DEBUG-CLOSE","(default=0) value 1 enables extensive debugging info regarding the close structure, the simulation will run much slower");
keys.add("optional","LOG_CLOSE","same as LOG-CLOSE");
keys.add("optional","DEBUG_CLOSE","same as DEBUG-CLOSE");