Disclosed is an apparatus, method, service product, and program product which each provide an enhanced, registration-based event handler mechanism. The LNG stream is preheated against a distillation column overhead vapor stream and against an overhead vapor product prior to entering the column. Circularly permuted fluorescent polypeptides and polynucleotides are also provided. The connection unit is sewed to the folded sections so as to allow the transmission rope in the connection unit to move freely within the connection unit. The coupling signals caused by a reverse signal in the connecting point of the sensing conductors are arranged equal by their absolute value but oppositely phased, in which case their sum signal in the measurement port is insignificantly small. A mullion nosing is assembled to the jamb plates, and bridges the jamb plates to join together the two jamb plates and the nosing, to provide complete overlayment of the outer surface of the mullion substrate and to space the front panel of the nosing from the outer surface of the substrate.