Curves contain data points that can be shown in a plot. There are three different method to create curves: the standard xy-curve, a xy-curve from a mathematical expression and a xy-curve from a data analysis function.
The standard xy-curve can be filled with values of a spreadsheet by selecting the x-data and y-data as column of the spreadsheet in the xy-curve dock widget. Another method to fill a curve is to use a mathematical expression. Here you can select any mathematical function and range to create the curve. The third method to create a curve is to use a data analysis function. The data and the analysis function can be selected in the dock widget of the analysis function.
For all types of curves the line and symbols styles can be changed in the dock widget. Also annotated values and error bar settings can be changed here.