All indicators based on past data use a certain number of bars for their calculations. The number of bars is called '''Maximum number of bars a study will reference''', or '''Maximum Bars Back'''. You can elect select to set this value manually, or to have it set automatically (Auto-Detect). The Maximum Bars Back value '''cannot be smaller than 1''' and '''cannot be greater than actual number of bars on the chart'''. This value shows how many bars a study requires to be calculated before it can plot first results on the chart. It means that '''there can be no plot or any other visual output on the X number of bars at the beginning of the chart, where X = MaxBarsBack or Maximum number of bars a study will reference'''.