A method is performed at an electronic device with a display. On the display, the method displays a chart, which includes visual marks that represent a set of data. The chart also includes a first line and/or first band based on data in the set of data that corresponds to the displayed visual marks. The method detects one or more inputs that select a plurality (but less than all) of the displayed visual marks in the chart. In response to detecting the one or more inputs, the method displays a second line and/or second band based on data in the set of data that corresponds to the selected plurality of the displayed visual marks and maintains display of the chart and the first line and/or first band in the chart.