The Curve Options... item in the Options menu, brings up a dialog box in which one can set the default display behavior or line plots. One can control color, point styles, and line types.
Points: The checkbox preceding this item indicates whether the individual points of the curve should be drawn. The points can be drawn as any of the 6 listed shapes. The size of the points can either be fixed at a constant size indicated by the slidebar, or drawn with widths/heights indicating the X and Y error bars. If there are X/Y error bars but the points are drawn in a fixed style, the error bars will be indicated by horizontal/vertical lines centered on the point. Points can be Filled or just drawn in outline.
Lines: The checkbox preceding this item indicates whether data points will be connected with a continuous line. The line can be of several patterned styles or widths. The points can also be connected directly (Normal) or in a stair-step pattern (Histogram).
Clicking the Reset button will revert the options to their values when the dialog box was initially opened, undoing any modifications.