============================ attitude2d.txt ==================================
This file defines the columns of data in attitude2.log files. Each line of
each attitude2d.log file contains a precise two-dimensional attitude solution
for a constrained-length two-antenna baseline. See channeldef.txt for a
definition of ORT; note that ORT is close enough to true GPS time for the
difference to be ignored in many use cases of these attitude solutions.
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Column        Quantity

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

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

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

4 ----------- Azimuth angle in degrees

5 ----------- Azimuth angle 1-sigma uncertainty in degrees

6 ----------- Elevation angle in degrees

7 ----------- Elevation angle 1-sigma uncertainty in degrees

8,9,10 ------ X,Y,Z baseline vector between the two antennas expressed in 
              meters in the ECEF reference frame.

11 ---------- Number of double-differenced measurements contribution to this 
              solution

12 ---------- Ratio of second-best to best integer solution cost

13 ---------- 1 if integrity check is passed; 0 if solution is unreliable

14 ---------- 1 is solution is integer-fixed; 0 if solution is float

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