Your SQL command was:

 SELECT (htmID / power(2,24)) as htm_8 , 
 avg(ra) as ra, 
 avg(dec) as [dec], 
 count(*) as pop 
 FROM Galaxy 
 WHERE (0.7*u - 0.5*g - 0.2*i) < 1.25 
 and r < 21.75 
 group by (htmID /power(2,24)) 

Your query output (max 500,000 rows):