{HEAD ~ The method} also includes the steps of detecting the position and intensity of the first focused spot of radiant energy at the first imaging area to provide a first signal, processing the first signal to generate a first set of height data and {TAIL ~ a first set} of intensity data, detecting the position and intensity of the second focused spot of radiant energy at the second imaging area to provide a second signal and processing the second signal to generate a second set of height data and a second set of intensity data 
{ HEAD ~ The method } also includes the steps of detecting the position and intensity of the first focused spot of radiant energy at the first imaging area to provide a first signal , processing the first signal to generate a first set of height data and { TAIL ~ a first set } of intensity data , detecting the position and intensity of the second focused spot of radiant energy at the second imaging area to provide a second signal and processing the second signal to generate a second set of height data and a second set of intensity data
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