Do low PQ planets ALWAYS wind up with the same ultimate PQ? or is this just throwing out numbers?
I did a LOT of empirical testing which was detailed in another thread.
Bottom line is this:
PQ1 always get 6 new tiles per level of terraforming, finishing as PQ19.
PQ2 don't seem to occur naturally (without +PQ ability), so I didn't test.
PQ3 get 2,4, or 5 new tiles per level of TF, maturing to 9, 15, or 18.
(I forget the exact percentages, but 9 is
least common.)
PQ4 gets either 3 or 4 tiles per level of TF, maturing to 13 or 16.
(16 is considerably more common.)
PQ5 gets 1 or 2 tiles per level, maxing at 8 or 11. 11 is more common.
PQ6+ gets 1 new tile per level of TF.
Mars (which seems to be unique among PQ4 planets) gets 2 tiles per level, reaching 10.
PQ 1-4 planets don't seem to ever have bonus tiles, nor do they gain any as they are improved (though it would be an interesting mechanic to eventually FIND a precursor mine or library, buried under the slag.)
Also, planets with PQ less than a base of PQ6 don't seem to ever benefit from the +PQ racial ability, i.e. when they grow to a larger PQ where a 10% benefit might mean a tile increase, they do not get an extra tile.
drrider