An extendable channel unit such as molding unit has a pair of telescopically arranged relatively extendable conduits with a conductor interconnected in conductive relation between the conduits, with an intermediate section of the conductor effective to accommodate the relative extension of the conduits. The LED package comprises a package body and an LED chip mounted on the package body. The useful features are used to make predictions for the entire data set. The first damping layer comprises a first polymeric material and the first tape loading layer comprises a second polymeric material.