Quality information in VO Catalogs
2MASS All-Sky Point Source Catalog
We use the quality information in the Qflg provided by the 2MASS catalogue in Vizier.
where the possible values are described as:
The Qflg is a 3 character flag, one character per band [JHK].
We consider A, B, C and D as good values, X, E and F as bad and U as upper limit. That is, for instance, for the second character (that gives information about the H band):
- Qflg ∈ (A,B,C,D) → 2MASS/2MASS.H: good
- Qflg ∈ (X,E,F) → 2MASS/2MASS.H: bad
- Qflg ∈ (U) → 2MASS/2MASS.H: upper limit
See the catalogue description in
(you can also see a local copy
if the link does not work).