What is the definition of each member of structure TDistanceInfo

The system function getDistanceAdvanced() returns a TDistanceInfo structure. What does each field mean?

typedef struct
{
uword nMinimumDistance;
uword nMaximumDistance;
ubyte nSNRThreshold;
ubyte nBrightnessThreshold;
ubyte nFilterFactor;
ubyte nTransmitPower;
uword nBrightestTargetDistance;
ubyte nBrightestTargetSNR;
ubyte nBrightestTargetBrightness;
uword n1stStrongestTargetDistance;
ubyte n1stStrongestTargetSNR;
ubyte n1stStrongestTargetBrightness;
uword n2ndStrongestTargetDistance;
ubyte n2ndStrongestTargetSNR;
ubyte n2ndStrongestTargetBrightness;
} TDistanceInfo;