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Used in conjunction with the "hpslope" parameter to convert the raw results of
"head power full" and "head power off" measurements into Watts out of the head.
This parameter value is only used with "head power full" when using "head
power off" the actual offset to use is measured.
The raw reading of the shutter sensor is affected by the "head hpwrgain"
parameter setting so changing this value will require commensurate changes to
"hpoffset".
This value can only be calibrated if an external power meter is available and
hence this parameter should not be changed from its factory setting.
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