LDD for the FREND instrument on board ExoMars 2016/TGO Description of a FREND instrument observation Gap in measurement due to missing or bad data This section contains the simpleTypes that provide more constraints than those at the base data type level. The simpleTypes defined here build on the base data types. This is another component of the common dictionary and therefore falls within the common namespace. End time of a time interval with bad or missing data A running number of gaps in dosimeter data Start time of a time interval with bad or missing data UTC time of this frame, derived from spacecraft time through SPICE.