A method of forming integral articles having non-line-of-site contours includes the steps of providing a plurality of molds, the molds having at least one mold channel therethrough. In some embodiments, the print engines can include a reference print engine and one or more non-reference print engines. The spectrum of the radiation backscattered and emitted by the substance is measured in an energy range from 1 to 30 keV with a resolution of at least 250 eV. Pivotal movement of the latch occurs upon rotation of the buckle cover.