With two sensors, as in Figure 4-4, the sensor output voltage takes the form shown in Figure 4-12. These sensors do not need to be 90° apart to have unique data for the lookup table. However, best practice is to have the sensors close to 90° apart so that the unusable peaks of one signal are at the linear regions of the other signal, allowing the peak data to be ignored. To avoid losing the benefit of two sensors, the spacing cannot be approximately equal to either 0° or 180°. With a lookup table calibration phase, specific voltages for various angles are known, but the min and max voltage values are not known.