Pre-stored no-touch or no-hover sensor output values can initially be used when a sensor panel subsystem is first booted up to establish an initial baseline of sensor output values unaffected by fingers or other objects touching or hovering over the sensor panel during boot-up. In one embodiment, the content of the book can be presented by an electronic book device. In the formula: Y1 to Y8 are a chemical single bond, \u2014O\u2014, \u2014O\u2014C\u2014, \u2014O\u2014C\u2014O\u2014, etc. The model is learned from the features using expectation maximization to assess a joint probability of which features are most relevant.