The visibility of a column in a chart is plot specific. When a column or its measurement is set to invisible its data will not be shown in the chart. Measurements can be made entirely invisible in a chart. To change the visibility of a column in a chart:
Toggle the column's chart icon next to the column’s node in the Browser.
Choose Hide Column in Chart from the node's context menu to turn off a series; choose Show Column in Chart to turn it on.
Measurements can contain data which is not representable by a plot. This can occur when the measurement contains complex numbers, or if there is no data. When a measurement is not plottable the text in its note will become red, and if the measurement is visible in the chart its entry in the legend will describe it as 'not plottable'.