Figure 12.9a shows a plot of the output voltage versus the volume of liquid in
the tank from Table 12.1 for the uncompensated curve. The best-fit straight line
(dashed) gives an error of about ±15 percent of full scale reading (FSD). To correct
the mid-point of the scale for 5 V output when the tank is half full (Fig. 12.8b),
the circuit would require a 6.66-kΩ resistor from the wiper to ground as shown
in Fig. 12.9b (the resistor should be made with the same material as the potentiometer).