Outer circle radius: (relative to half width/height of display)
Inner circle radius*: (relative to outer circle radius)
Number of cycles to draw: 1
Hole position*: (relative to inner circle radius)
Inside: (whether the inner circle runs inside or outside the outer one)
Line colour:
Clear display:

* The inner circle radius and hole position can be specified as either decimal numbers (0.375) or as fractions (3/8).