18.15  TDARRO 

This draws an arrow from XYZ(1:3,1) to XYZ(1:3,2)
     CALL TDARRO(XYZ,[DXYZ,[IMODE,[ITYPE]]])
     1.  XYZ(3,2)  is  the array of XYZ to specify the arrow.  XYZ(*,1) is
         the tail while XYZ(*,2) is the head.  For 2-d plots the  z  value
         is ignored.
     2.  DXYZ(4) specifies the offsets and size.
         A.  DXYZ(1) - The offset for the tail of arrow
         B.  DXYZ(2) - The offset for the head of the arrow
         C.  DXYZ(3) - Size of arrow if zero the default is used.
         D.  DXYZ(4) - Flare of arrow if zero the default is used.
     3.  IMODE(2)  -  Specifies the frame.  DATA=0, TEXT=1 IMODE(1) is for
         tail of arrow.
     4.  ITYPE - Specifies the Texture,color,intensity
For  more  information  see  TOPDRAWER COMMAND ARROW.   This is similar to
giving the command.
     TD:ARROW    FROM    XYZ(1,1),XYZ(2,1),XYZ(3,1)    LESS   DXYZ(1)   TO
XYZ(1,2),XYZ(2,2),XYZ(3,2)  LESS  DXYZ(2)   SIZE=DXYZ(3),DXYZ(4)   Outputs
extended titles with case formatting.
This  routine  is  not recommended.  It is provided for compatability with
older versions of TOPDRAWER.  Use TDTEXT instead.
     CALL TDCASE('title','case'[,x,y])
     CALL TDCASE('title','case','position')
     CALL TDCASE('title')

See TDTITL for more information