void errorbar (x, xmin, xmax, y, ymin, ymax)  CURVES.C Level 3
 
float x The x location of the error bar.
float xmin The left end of the error bar.
float xmax  The right end of the error bar.
float y The y location of the error bar.
float ymin The bottom end of the error bar.
float ymax The top end of the error bar.
 
Using errorbar(), a user can plot an error bar at any point on the curve. Different line styles are available for the bars by calling dashf().