This file defines the columns of data in the bosch.log and lord.log files produced
by the GRID software receiver. Each imu.log file contains
time-stamped imu measurements.

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Column        Quantity

1 ----------- ORT week number.

2 ----------- ORT whole seconds of week.

3 ----------- ORT fractional second.

4,5,6 ------- X,Y,Z Specific force measurements in m/s^2

7,8,9 ------- Angular rate measuremens in Angular rate (deg/sec) about each axis.

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