SET CURVE STYLES allows the style of representation of all possible curves which may be displayed by the program to be changed. (Typically 100 different curve styles may be set.) The user specifies the range of curves to be affected, and specifies whether line, marker, and/or error bars are to be displayed. If a line is to be displayed the user is requested to choose colour, line type, and line width attributes. If markers are to be displayed the user can select the type of markers to be displayed, together with their colour, size, line width and interior fill colour. Similarly for error bars the style, colour, and line width may be selected. (If variance estimates are not present no error bars will be displayed, even if they are selected herewithin.)