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The number of pixels turned on during an edge search. Should not be changed from the
default. An incorrect number of pixels can significantly affect edge detection
accuracy.
Service note: If you need to change the number of pixels used to find the edge, either the
amount of light coming out of the head is set very wrong or the amount of light reflecting
back to the head is very wrong. In the first case hdp epwr needs to be adjusted, and in
the second case drum epos needs to be adjusted. The HRX edge detect setup script will set
both epos and epwr. It is available on the hrx support pages (url listed below).
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