HLINES is the jGraph module of jLab.

 HLINES   Add horizontal lines to a plot.
    HLINES(Y,STYLE) puts horizontal lines at locations Y having style
    described by the string STYLE.  HLINES draws the lines to fit the
    current axis.
    The SYTLE strings follow the format specified in LINESTYLE.  Thus
    STYLE='2b--' draws blue dotted lines of width 2.
    HLINES(Y) uses the default STYLE='g--', a green dashed line.
    H=HLINES(...) returns an array of handles H to the lines.
    See also VLINES, DLINES.	
    This is part of JLAB --- type 'help jlab' for more information 
    (C) 2000--2008 J.M. Lilly --- type 'help jlab_license' for details

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