FILL=<density>,<init.val.>,<fin.val.>,<base val. or var.>,<line_type> (in PLOT operation for time series) draws line segments parallel to Y axis from the points on the time series curve to another time series <base variable> or to a fixed <base value>. <base val. or var.> is optional and default is 0. The area to be filled by these line segments is limited by the optional parameters <initial value>,<final value>given as indices 1,2,...,Nof the observations. Default is the whole plotting range. <density> (an integer 1,2,3...) gives the gap between the consecutive fill lines as a multiple of the plotting unit. <line_type> (optional) gives the form of the line for the <base variable>. Possible values of <line_type> are 1,2,3,4,5 (default 1) and their interpretation is same as that of the first parameter (line type) of the LINE specification. Example: PLOT TDATA1,TIME(Year),Ser1 / FILL=4,1,35,Trend1 plots Ser1 and fills the area between Ser1 and Trend1 for the first 35 observations. The gap between fill lines is 4 plotting units. FILL-=<density> (in PLOT operation for time series on plotter only) supports the FILL specification by giving the possibility to fill the negative parts between the series to be plotted by using another density (color). If FILL- is not given, filling takes place according to FILL for both positive and negative parts.

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