18.16  TDCRCL 

This draws either a BOX, DIAMOND, or ELLIPSE.
     CALL TDCRCL(XY,DXY,ITYPE,[IDATA,[MODE[,ANGLES]]]);
     1.  XY(3) is the array of XYZ to specify the center of the figure.
     2.  DXY(3) is the array of XYZ to specify the width of the figure.
     3.  ITYPE
                1        2       3
              BOX  DIAMOND ELLIPSE
     4.  IDATA
              0 - XYZ specified in text coordinates
              1 - Center in Data, width in text coordinates.
              3 - Both Center and width are in data coordinates. 
     5.  MODE      -      Specifies     Texture,     intensity,     color.
         See:Subroutine TDHIST.
     6.  ANGLES(2) - Range of angles for circle

                                  example
     REAL XY(3),DXY(3)
     DATA XY/1.,1.,1./,DXY/.5,.5,.5/
     CALL TDCRCL(XY,DXY,3,3)
Draws an ellipse centered at 1,1,1 of size 0.5 in the data frame.