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Specifies the maximum percentage difference allowed between the stroke cal
target light level and and the measured light level for any channel. If all
differences are less than "bpmaxerr" percent then the stroke cal succeeds
otherwise the error "Unable to balance stroke to better than head bpmaxerr
percent" will be generated. All new heads are capable of balancing to within 3
percent. Raising "bpmaxerr" to 5% is usually okay on most media. Stroke cal
noise is also very dependent on the beam pointing so it may be possible to
improve the stroke cal by changing "bposn" if things have moved slightly in
the head. When changing bposn try steps of about +/- 200.
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