Methods, a data structure and computer readable mediums address newly-defined code points in a Unicode index of characters by allowing processing of strings that use those newly-defined code points although a database holding an index of Unicode characters has not yet been updated. The sample and hold circuit includes a first transistor, a capacitor, and a plurality of switches, for sampling and holding the data current sunk to an output terminal of a data driver. Modulated light is conditioned as necessary, then focused through a print lens onto photosensitive medium. The retaining member is operable to receive and retain a writing implement disposed in the cavity. Finally, the temperature of the immersion liquid is changed until the determined imaging property is as close as possible to the target imaging property.