GRAPHREP

SET x_param:1cm 

SET y_param:1cm

 

FILL color:blue

ELLIPSE x:c y:c rx:(x_param) ry:(y_param)

 

FILL color:white

ELLIPSE x:c y:c rx:(0.666*x_param) ry:(0.666*y_param)

 

FILL color:orange

ELLIPSE x:c y:c rx:(0.333*x_param) ry:(0.333*y_param)