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The arguments to `symbol`

and `line`

must be integers between
-9 and 29, inclusive.

The symbol and line styles are as follows. Styles 1 through 9 refer to symbols at the locations of the data points, connected by lines. The symbols are:

- dots (.)
- plus (+)
- times (x)
- box
- upward-pointing triangle
- diamond
- downward-pointing triangle
- four-line asterisk (+ and x combined)
- circle

Styles -9 to -1 refer to symbols at the locations of the data points, without connecting lines. The symbols are the same as for the corresponding positive numbers. Style 0 is invisible. Styles 10 through 19 refer to variously dotted and dashed lines connecting the data points. The styles are:

- short-dashed
- medium-dashed
- long-dashed
- dot-short-dashed
- dot-medium-dashed
- dotted
- dot-dot-dashed
- dot-dash-dashed
- dot-dot-dash-dashed
- short-medium-dashed

Style 20 refers to a bar-style plot in which successive data points are connected by a horizontal and a vertical line. Styles 21 through 29 refer again to symbols at the locations of the data points, connected by lines. The symbols are:

- e
- f
- g
- h
- i
- j
- k
- l
- m

You can use `line`

to select the line style connecting the symbols
selected with a positive `symbol`

. By default, the symbols are
connected by solid lines.