0 0 NOMINAL- ALTITUDE AND EPHEMERIS DATA AVAILABLE
1 1 MISSING AT MOST A SMALL GAP OF ALTITUDE AND EPHEMERIS
2 2 MISSING MORE THAN A SMALL GAP OF ALTITUDE AND EPHEMERIS DATA, BUT NO MORE THAN A GRANULE BOUNDARY
3 3 MISSING MORE THAN GRANULE BOUNDARY OF ALTITUDE AND EPHEMERIS
15 15 MISSING VALUE
