PLplot can draw graphs consisting of points with optional error bars,
      line segments or histograms.  Functions which perform each of these
      actions may be called after setting up the plotting environment using
      plenv.  All of the following functions draw within the box defined
      by plenv, and any lines crossing the boundary are clipped.
      Functions are also provided for drawing surface and contour
      representations of multi-dimensional functions.  See Chapter 3 for discussion of finer control of plot
	generation.
    
	plpoin and plsym mark out n points
	(x[i], y[i]) with the specified symbol.  The
	routines differ only in the interpretation of the symbol codes.
	plpoin uses an extended ASCII representation, with the printable
	ASCII codes mapping to the respective characters in the current
	font, and the codes from 0–31 mapping to various useful
	symbols.  In plsym however, the code is a Hershey font code
	number.  Example programs are provided which display each of the
	symbols available using these routines.
      
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PLplot provides two functions for drawing line graphs. All lines are drawn in the currently selected color, style and width. See the Section called Setting Line Attributes in Chapter 3 for information about changing these parameters.
	plline draws a line or curve.  The curve consists of
	n-1 line segments joining the n
	points in the input arrays.  For single line segments, pljoin is
	used to join two points.
      
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	plptex allows text to be written within the limits set by plenv.
	The reference point of a text string may be located anywhere along an
	imaginary horizontal line passing through the string at half the
	height of a capital letter.  The parameter
	just specifies where along this line the
	reference point is located.  The string is then rotated about the
	reference point through an angle specified by the parameters
	dx and dy, so that the
	string becomes parallel to a line joining (x, y)
	to (x+dx, y+dy).
      
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Area fills are done in the currently selected color, line style, line width and pattern style.
	plfill fills a polygon.  The polygon consists of
	n vertices which define the polygon.
      
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	Functions plbin and plhist are provided for drawing histograms,
	and functions plerrx and plerry draw error bars about specified
	points.  There are lots more too (see Chapter 16).