map icon questions

[CobraAus]

can any one on design team explain to me the map icons and the cause affect in having 4
colomms
are they only for color changes which I dont think is explained in manual
do colomns 1 2 3 4 relate to differant base levels such as 1 for level 1 to ?
and 4 a level 10 base
any info would be helpfull

[Bodhi]

Not on the design team, so you can probably discount this reply. [;)]

However, I'm pretty sure I've seen the color of the icon change due to the number of troops in the hex. Shouldn't be too difficult to set up a small test scenario with various levels of troops in bases or base size/fortification level and see if the icon changes.