Design, construction, and performance of VIRUS-P: the prototype of a highly replicated integral-field spectrograph for HET

Video data and TXT data are combined into a single image. The video data is representative of a mosaic of video windows. The TXT data form a plurality of TXT pages. Each TXT page is transparent in an area of one or more corresponding video windows. In an interactive application, a customized TXT page guides a user through a virtual world in video and TXT combined.