In many parts of the galaxy map, there are objects that most astronomers agree belong together, but in fact are not actually shown together. Because different techniques are used to estimate distances for different object types, it is common for the distance estimates used on this map to separate objects (sometimes by several hundred parsecs or more) that really should be close together. The question is: which distance estimate (if any) for several related objects is the best one to use?
I don't always have the answers yet, but in the mean time I'll list some examples of these distance discrepancies in this section and try to suggest ways to resolve them if possible.