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Perhaps the information is too specific for the reference section, but I couldn't find a better place, so I'm posting it here.
**Dependence of the appearance of the "greened" stack on coordinates**
Whether or not a "greened" stack appears depends on the following condition:
([ax + by + cz + d] mod 32768) mod 100 < 50, where
a = 2992.911117
b = 14174.264968
c = 5325.181015
d = 32788.727920
0 <= x <= 143
0 <= y <= 143
z = 0 for the surface
z = 1 for the underground
[x] = floor(x)
A "greened" stack will appear if the condition is met.
Location of neutral creatures with a "greened" stack for a 144 x 144 map with an underground and without
0 - no "greened" stack, 1 - "greened" stack present.
You can check a cell (x, y, z) for a "greened" stack using the
Bitmap Generator program.