A superconducting tunable filter is disclosed that has a center frequency and a bandwidth able to be adjusted separately. The check code produced using the stored version of the data set is compared with a test code produced using a correct version of the data set, to indicate whether the correct data set was successfully stored on the device. The flexible compartment may have at least one reservoir with a height to volume ratio of about 0. The interval of welding spots is in a range of approximately 11 to 15 times the thickness of the shadow mask. The adhesive may also include from 1 to 10 wt % of at least one functionalized polyolefin. The blending frame is preferably located a distance Dframe from the aperture of the projector and has an optimal half frame width Wf from the axis of the lens of the projector.