meaning of default_statistics_target

[Martin Marques <martin@xxxxxxxxxxxxxxxxxxx>]

I'm trying to understand the implications of changing the value of the 
STATISTICS of a column with ALTER TABLE, and there are somethings I'm 
not understanding correctly.

How much, and which extra statistics information will ANALYZE gather if 
I set a higher value for one specific column (maybe one with and index, 
and heavily used in SELECT clauses)? If instead of 100 I set a column to 
250, which extra data will I see in pg_statistics after an ANALYZE?

Thanks.