[ADVANCED\]UV_PREVIEW /BROWSE [Ataper] [/FILE FileIn] [Drop]] Use a "split window" previewer instead of just one window. The bot- tom window displays full spectra for all tapers, the top window is a us- er-controlled zoom of one of the tapers, with spectral line identifica- tions if a catalog is available. The cursor is called and the user can adjust the zoom display with it. Press H for help, E for exit. Ataper indicates the taper number (default: last one).