b'Metadata standards for MTFeatureTable 1. Continued .Parameter Units Compulsory orExplanationoptionalBx sampling rate Hz Compulsory Sample rate for magnetic field (X direction as defined by Bx azimuth)Bx channel gain Float Compulsory Magnetic field instrument gain (X direction as defined by Bx azimuth) equal to 1 if no gainBx azimuth Degrees Compulsory Magnetic Y field measurement azimuth clockwise from magnetic or true north depending on north reference aboveBx coil number Integer Optional Bx Coil NumberBy sampling rate Hz Compulsory Sample rate for magnetic field (Y direction as defined by By azimuth)By channel gain Compulsory Magnetic field instrument gain (Y direction as defined by By azimuth)By azimuth Degrees Compulsory Magnetic X field measurement azimuth clockwise from magnetic or true north depending on north reference aboveBy coil number Integer Optional By coil numberBz sampling rate Hz Compulsory Sample rate for magnetic field (vertical direction)Bz channel gain Compulsory Magnetic field instrument gain (vertical direction)Bz coil number Integer Optional Vertical coil numberMag sensor number Character string Optional Identifying number on magnetic sensor instrument if not using coilsBx (from data recorder) nT Optional X magnetic field reading from box for QA purposesBy (from data recorder) nT Optional Y magnetic field reading from box for QA purposesBz (from data recorder) nT Optional Vertical magnetic field reading from box for QA purposesEx sample rate Hz Compulsory Ex sample rateEx dipole Length Metres Compulsory Length of X electrode dipoleEx azimuth Degrees Compulsory Azimuth (clockwise from north reference) of X electric fieldEx channel interface box gain Compulsory Ex field gain applied at the data recorder (value of 1 if no gain)Ex channel pre amplification gain Compulsory Ex field gain applied as pre-amplification before the data recorder (value of 1 if no gain)Ex resistance kohm Optional Resistance across Ex dipoleEx positive Length Metres Optional Length of Ex from positive x direction (defined by Ex azimuth) to instrument. In a standard deployment with Ex oriented North-South this would be the length from the central box to the north electrode however this allows for deployments with Ex oriented in different directionsEx positive electrode longitude Dec. degrees Optional Longitude of Ex positive electrodeEx positive electrode latitude Dec. degrees Optional Latitude of Ex positive electrodeEx positive electrode number Character string Optional Identifying number on Ex (positive) electrodeEx positive resistance to ground kohm Optional Resistance to ground on Ex (positive) electrodeEx negative length Metres Optional Length of Ex from negative x direction (Ex azimuth + 180 degrees) to instrument. In a standard deployment with Ex oriented North-South this would be the length from the central box to the south electrodeEx negative electrode longitude Dec. degrees Optional Longitude of Ex negative electrodeEx negative electrode latitude Dec. degrees Optional Latitude of Ex negative electrodeEx negative electrode number Character string Optional Identifying number on Ex (negative) electrodeEx negative resistance to ground kohm Optional Resistance to ground on Ex (negative) electrode(Continued)51 PREVIEW APRIL 2019'