A catadioptric projection lens for use in microlithographic projection-exposure apparatus includes a plurality of refractive optical elements having intrinsic birefringence both in a catadioptric part and in a dioptric part adjacent to the image plane. The exterior portion of each base has an extension continuing downward from the bottom portion of each base for mounting in a ground surface or sleeve. Analysis can include, for example, generating a thickness map, a cartilage curve, or a point cloud. The method also includes determining a first intensity value associated with the first image of the region, and comparing the first intensity value with a first training intensity value of a region of a training document. A method of a retaining items on a shelf is also disclosed. Further, the input impedance of the antenna remains reasonable.