question about ILLUMINACLIP 2:30:10

[ghost]

Hello,

I have difficulties to understand the meaning of "2:30:10" for adaptor removal command.
The manual of Trimmomatic describes:

ILLUMINACLIP:<fastaWithAdaptersEtc>:<seed mismatches>:<palindrome clip threshold>:<simple clip threshold> 

seedMismatches: specifies the maximum mismatch count which will still allow a full match to be performed

palindromeClipThreshold: specifies how accurate the match between the two 'adapter ligated' reads must be for PE palindrome read alignment.

simpleClipThreshold: specifies how accurate the match between any adapter etc. sequence must be against a read

What exactly is the "ClipThreshold" and how are the values (30 and 10) calculated?

Many thanks in advance,

silviac