A system and method for reading a magnetic medium having a data band thereon, the data band comprising a plurality of written data tracks and in some embodiments at least one alignment band. A plurality of straight, non-interleaving ribs extend substantially perpendicularly from a first and second lengthwise side of each radiating structure. 05 atm for 168 hours; and condition 2: the adhesive does not bring on a delamination and a blister between the substrates after keeping the laminate in a chamber which acts as a highly accelerated stress test system under pressurized steam conditions of 105\xb0 C. Second, for each incoming product, a parameter value is calculated for each of the two or more types of end products that may be produced from the incoming product. The check valve is opened each time the sampler is pulled upwards allowing fluid to enter the interior cavity. The resultant improved device can also be applied for correcting the difference in optical intensity created by the manufacturing tolerances inherent in the fabrication of array waveguide gratings.