b'Metadata standards for MTFeatureTable 1. Continued .Parameter Units Compulsory orExplanationoptionalEx AC MilliVolts Optional AC variation in X electric fieldEx DC MilliVolts Optional DC level of X electric fieldEy sample rate Hz Compulsory Ey sample rateEy dipole Length Metres Compulsory Length of Y electrode dipoleEy azimuth Degrees Compulsory Azimuth (clockwise from north reference) of Y electric fieldEy channel interface box gain Compulsory Ey Field Gain applied at the data recorder (value of 1 if no gain)Ey channel pre amplification gain Compulsory Ey Field Gain applied as pre-amplification before the data recorder (value of 1 if no gain)Ey resistance kohm Optional Resistance across Ey electrode dipoleEy positive length Metres Optional Length of Ey from positive y direction (defined by Ey azimuth) to instrument. In a standard deployment with Ey oriented East-West this would be the length from the central box to the east electrodeEy positive electrode longitude Dec. degrees Optional Longitude of Ey positive electrodeEy positive electrode latitude Dec. degrees Optional Latitude of Ey positive electrodeEy positive electrode number Character string Optional Identifying number on Ey (positive) electrodeEy positive resistance to ground kohm Optional Resistance to ground on Ey (positive) electrodeEy negative Length Metres Optional Length of Ey from negative Y direction (Ey azimuth + 180 degrees) to instrument. In a standard deployment with Ey oriented East-West this would be the length from the central box to the west electrodeEy negative electrode longitude Dec. degrees Optional Longitude of Ey negative electrodeEy negative electrode latitude Dec. degrees Optional Latitude of Ey negative electrodeEy Negative electrode number Character string Optional Identifying number on Ey (negative) electrodeEy Negative resistance to ground kohm Optional Resistance to ground on Ey (negative) electrodeEy AC milliVolts Optional AC variation in Y electric fieldEy DC milliVolts Optional DC level of Y electric fieldGround / centre electrode number Character string Optional Identifying number on ground electrodeBattery voltage no load Volts Optional Voltage measured using a multimeter before battery is connectedBattery voltage under load Volts Optional Voltage measured using a multimeter once the instrument isset up and is under load, with solar panel connected if being used.Battery voltage data recorder Volts Optional Battery voltage from data recorderCase No Character string Optional Identifying number on instrument caseData recorder number Character string Optional Identifying number on data recorderInterface box number Character string Optional Identifying number on interface box (electric field connection)Data storage device number Character string Optional Identifying number on data storage devicee.g. hard drive, memory card etc.Deployment comments Character string Optional Comments relevant to deployment that might have bearing on later processingNumber of photosdeployment Integer Optional 0 or number of photosPhoto identification Character string Optional For each photo, photo ID separated by semicolonLocal start time YYYY:MM:DD:HH:MM:SS.SS Compulsory Local finish date and time (YYYY:MM:DD:HH:MM:SS) of recordingEx resistance; finish kohm Optional Resistance across Ex electrode dipole on pickup(Continued)APRIL 2019 PREVIEW 52'