Each dark file has the same format. Each line starts with an identifier I,
A or B, with I for GPS information, A for measurements in sea mode (low
gain), and B for measurements in sun mode (high gain). Following the
identifier I, we have latitute (ms), longitude (ms), Julian day, time (s),
heading (degx10), speed (cm/s), pressure (mbx10), and temperature (deg C).
Following the identifier A, we have the digitized signal in the five
spectral bands of the instrument (low gain detectors), yaw (degx10), roll
(degx10), and pitch (degx10). Following the identifier B, we have the
digitized signal in the five spectral bands of the instrument (high gain
detectors), yaw (degx10), roll (degx10), and pitch (degx10). Each digitized
signal is averaged over 1 second.

I 118346905 -419090299 255 50261 122 2163 6891 19
A -26 -44 -6 24 11 1100 -439 161
A -23 -41 -7 27 12 1050 -437 190
A -20 -39 -7 29 11 1050 -427 181
A -24 -41 -5 28 11 1042 -427 183
A -25 -37 -3 27 11 1056 -432 174
A -24 -43 -4 24 12 1034 -437 185
A -22 -41 -7 27 10 1041 -429 181
A -22 -40 -7 25 13 1023 -435 190
A -21 -39 -5 29 11 1052 -445 166
A -22 -39 -6 25 13 1022 -444 188
B -99 -76 -19 -55 -36 1043 -436 163
B -98 -76 -18 -54 -35 1031 -434 170
B -99 -75 -20 -55 -33 1012 -453 179
B -100 -75 -18 -56 -34 1014 -438 181
B -101 -74 -19 -57 -33 1012 -431 183
B -101 -77 -19 -56 -36 1022 -442 179
B -102 -74 -21 -56 -33 1030 -429 172
B -102 -74 -21 -56 -32 1023 -438 179
B -103 -76 -19 -58 -34 1008 -440 185
B -102 -78 -19 -54 -36 1053 -439 157