INDICES FOR TABLE Match

records what objects in one run are re-observed in other runs.

When an object is missing in the second run we use the nearest object in the second run Misses are flag and colored as (green: well inside the overlap
green: well inside the overlap,
yellow: on the edge of the overlap
red: covered by a mask in the second run.

The match radius is 1 arcsecond (beyond that it is considered a miss.
The object also points to a canoncal 'match head' object of the cluster.

Index Type Key or Field List

primary key objID1, objID2

foreign key PhotoObjAll(objID)

foreign key MatchHead(objid)

covering index matchHead

Index Type	Key or Field List
primary key	objID1, objID2
foreign key	PhotoObjAll(objID)
foreign key	MatchHead(objid)
covering index	matchHead