1. A range of frequencies such as those passed (band-pass) or rejected (band-reject) by a filter. Measurements are usually made between points where the amplitude is down by 3 dB (or down 30%) from the peak value; see also bandwidth. 2. The names given to the frequency ranges of the electromagnetic spectrum, as shown in Figure E-11. 3. Landsat data channels; see Landsat image. 4. A track on magnetic tape.