descr_climates.txt values?

[Userprobe]

I'm wondering if anybody knows exactly about the meaning of the numbers in red, inside the descr_climates.txt file???
I'm only sure about them, that they have something to do with modelling, animation or similar graphically stuff!?!
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strategy summer sparse_tree conifer_a.cas 2
strategy summer dense_tree conifer_a_impassable.cas 3
strategy summer canopy conifer_a_canopy.cas 14

strategy winter sparse_tree conifer_a_winter.cas 7
strategy winter dense_tree conifer_a_impassable_winter.cas 6
strategy winter canopy conifer_a_canopy_winter.cas 15
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Added:
In the past i've read about them somewhere, but i cant remember where and what. I've also fixed the vanilla-american-palm-bug at that time, by testing with those values, but now after some month i cant remember anything about them , and nor can i find some useable informations anywhere!!!