LINE is the color, line type, line width, line label freqency,
smoothing separated by slashes, and flag to suppress small contours. The
individual values in each group are separated by semicolons:
LINE = 1;2 / 7;8 / 4;5 / 2 / 2 / T
assigns colors 1 and 2 to alternate lines, dashing patterns 7 and 8 to
alternate lines, line widths 4 and 5 to alternate lines, and labels
every other line. Smoothing level 2 is used on all lines. Contours with
7 points or less wil not be drawn.
If any specification is missing, a default of 1 is used. Except for the
smoothing, which defaults to 0, or no smoothing. If a color number of 0
is given, no plotting will be done. The suppress small contour flag will
default to F, drawing small contours.
Information on color selection can be found in the help for COLORS.
There are ten distinct line types:
1 - solid
2 - short dashed
3 - medium dashed
4 - long dash short dash
5 - long dash
6 - long dash three short dashes
7 - long dash dot
8 - long dash three dots
9 - medium dash dot
10 - dotted
These patterns can be expanded or compressed by prefixing the single
digit with a number from 1 to 9. A prefix of 1 compresses the pattern,
2 is the default and prefixes 3 -- 9 expand the basic pattern. For
example, 32 expands line type 2 while 12 compresses the same pattern.
If the line type is set to a single negative number, negative contour
values will use the absolute value of the line type, and positive
values will be solid.
If the label information is a single number, n, then every nth line
will be labelled. If the label information is a single number, -n,
then every nth line will be labelled, however, there will not be a break
in the line for the label. If a label is a sequence of numbers separated
by semicolons, lines corresponding to values other than 0 will be
labelled. The pattern established will be repeated to accommodate all
The smoothing level is an integer which specifies the amount of
smoothing to apply using a parametric curve function. The current values
are 0, 1 and 2 which correspond to no smoothing and two levels of
The filter is a real value that specifies the amount of filtering of the
points on a line. Smaller values allow for more points, while larger
values reduce the number of points on the line. Valid values are in the
range of 0.0 to 1.0. The default is 0.0 which means that no reduction
in the number of points will occur.
The suppress small contour flag allows the user to specify whether or not
to draw a contour with 7 points or less. The default is F or FALSE which
allows all contours to be drawn. Setting the flag to T or TRUE will have
the small contours not drawn.