On the Smith chart shown in Figure E9-3, what is the only straight line shown?

توضیح

Everything drawn on the chart in Figure E9-3 is curved except the horizontal line through its middle, marked 0 at the left and running through 0.2, 0.5, 1.0, 2.0, 5.0 and 20 to ∞ at the right. That line carries the resistance values and is the resistance axis.