[Pre-BB] MapleStory Formula Compilation

To put it bluntly... are there any Meso Explosion range formulas/approximations?

I found this thread on Sleepywood, which had a formula in the last post, but I'm not sure what it's for.

Code:

9.4 (log x)^.5
--------------  - 1.7 (log x - 2.3)^2 + 0.094
log (x / 5)

Not to mention it's over 2 years old... no telling what Nexon's done to the formula since.