Off-track time shift estimates are determined and used in order to write subsequent trigger patterns on a storage medium at different track pitches. The apparatus includes a plate of sufficient thickness to impart strength in supporting a solid particle bed, and is milled to have narrow slots allowing the flow of fluid through the plate, while preventing the passage of catalyst through the plate. The separate measurement instruments of the present application are mounted on a base which is rotatably pivoted around a joint at a location remote from the optical entry apertures of the instruments. Once this has been done, a transmission is sent indicating the updated first value from the first node to the second node. Software implementations such as application products may be divided into features and components to improve on-demand installation thereof.