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QBIAS prints what value the system is currently assuming for the chip bias level. BIAS alter it.
QBIAS requires none. BIAS requires one, the new bias level. If omitted, the current bias is shown, and a new value will be prompted for.
Adam:> BIAS 200
The bias level is used in various parts of the system. For example, PHOTOM subtracts it before estimating centres of gravity, and so does the automatic FOCUS procedure.