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gaia early data release 3 documentation

9.4 ADQL queries

9.4.5 G magnitude difference for neighbours within 100 mas

select floor(magnitude_difference * 1000.) / 1000. as magnitude_difference_bin,
  count(*) as n
from edr3.dr2_neighbourhood
where angular_distance < 100
group by magnitude_difference_bin
order by magnitude_difference_bin