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PLTAL

       SUBROUTINE  PLTAL (PX,PY,PZ,QX,QY,QZ,TEXT,LENTXT,
      X                   H,SIZE,HEAD,NTIME)
 C$    (Arrow with Label)
 C$    Draw an arrow directed at a point.  The arguments are:
 C$
 C$    (PX,PY,PZ).....Coordinates of tail of arrow.
 C$    (QX,QY,QZ).....Coordinates of point to which arrow is
 C$                   directed.
 C$    TEXT(*)........Text string to be plotted along arrow.
 C$    LENTXT.........Length of text string.
 C$    H..............Height of text string.
 C$    SIZE...........Length of arrow.
 C$    HEAD...........Length of the arrow point.  a typical
 C$                   value would be about 0.05*SIZE.
 C$    NTIME..........Number of segments to form the head cone.
 C$    (18-Feb-1991)