This dialog is activated by selecting the Edit Range... command from the Format Menu. It may also be activated by right-clicking on a plot curve and selecting Edit Range.... This dialog can be opened only if there is a selected data curve in the active plot layer.
This dialog may be used in order to change the visible data range for a 2D plot curve. By default, the Auto boxes are checked and QtiPlot displays the start row number (1) and the end row number corresponding to the full data range of the curve. In order to edit these values the Auto boxes must be unchecked first.