v$pga_target_advice: PGA_TARGET_FOR_ESTIMATE and pga_aggregate_target

** this is for 19c(19.18.0.0.0)

when i query v$pga_target_advice, was PGA_TARGET_FOR_ESTIMATE referring to pga_aggregate_target.

PGA TARGET           PGA_TARGET_FACTOR 

---------- ---------- ------------ ----------------

   2250    .75   

   3000     1    

   3600    1.2    

SQL> show parameter pga

pga_aggregate_limit         big integer 6000M

pga_aggregate_target         big integer 1G

I was expecting v$pga_target_advice to show pga target as 1G for factor of 1, but i see it had 3G for that. Did i misunderstood that numbers?