Trend Bands are used to draw straight bands on any chart. Think of a Trend Band as an extension to the standard Trend Line, with user-defined bands either side of the central trend line. These bands are based on a percentage of variance either side of the main line, with a semi-transparent shading filling in the bands.
This is a companion discussion topic for the original entry at https://www.optuma.com/kb/optuma/tools/line-studies/trend-band