See also Zen's docufile...

Magnet control data ( ntp8 )
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The index "0" in "mag0" corresponds to the magnet circuit. 

runNumber            : run number
evtNumber            : event number
mag0TransductIdx     : transductor used, 0: cage transductor, 1: PS transductor
mag0UseNMRread       : use nmr read value from this magnet
mag0Time             : unix time of this read
mag0Status           : read status bits
mag0Polarity         : magnet polarity (+/- 1 )
mag0FieldSetPoint    : magnet setpoint in kGauss
mag0Field            : magnet field calculated from transductor reading
mag0CurrSetPoint     : magnet circuit current (A) setpoint
mag0Curr             : magnet circuit current (A)
mag0MomentumSetPoint : magnet momentum setpoint calculated from current setpoint


NMR data ( ntp9 )
*****************
The index "1" in "nmr1" corresponds to the first NMR probe

runNumber            : run number
evtNumber            : event number
nmr1IsFeedback       : is 1 if this probe is used for field feedback to magnet control
nmr1Polarity         : NMR probe polarity ( +/- 1 )
nmr1Status           : NMR probe status bits
nmr1Quality          : NMR data quality, combination of status bits (=1 if good data)
nmr1Unit             : 0 is MHz, 1 is Tesla
nmr1Time             : unix time of this read
nmr1Field            : measure field value
nmr1SeqN             : measurement sequence number