significant increments to avoid over crowding of scale values on dense scale segments to visually distinguish between adjacent data range segments the chart background color and or the data value representation points lines bars etc within each data range segment are set coloring the data value representations works well with a single data set but is less effective where multiple data sets already employ color as a distinguishing factor coloring the chart background works well with single or multiple data sets discrete colors may be arbitrarily chosen or a scheme of related colors varying according to scale density may be used for example the background color of a chart may be darker the higher the density of the associated scale segment further distinctions between adjacent data range segments may be achieved by drawing a line at the extremities of each segment when a chart is displayed a user may interactively adjust existing data range segments or define new data range segments adjustments may include deletion in other words remove the special treatment of a data cluster varying a data range segment scale interval varying a data segment range or setting of data range segment scale attributes 3 adjusting the amount of display density assigned to a data range segment and this is best understood by looking at an example referring to fig1 a chart 10 includes three main components the main data display area.