A frequency offset correction system includes a phase shift estimation unit and correction unit. The platform can include a device management service server in which the DMS server can act as a gateway for communications with one or more computing devices, and the computing devices are associated with a first entity. The fiber optic element can include at least one optical fiber positioned within a protective tube. The exposed portions of the metal layer are removed by a chemicalphysical etching technique whereafter the remaining photoresist is removed and the remaining metal layer is diffused into the substrate by a heat treatment. The diameter of the partition pipe section is different from the diameter of the first end. The methods include defining at least two zones within a field of a mask having substantially similar overlay error values.