SAMtools pileup format

[dong01]

Hi,

Does anybody can tell me where I can find the detail explanation of pileup format? by reading the manual from http://samtools.sourceforge.net/pileup.shtml, I still don't understand some symbols such as ^~, ^l, ^k

--------------------------
seq1 1 C 1 ^~. <
seq1 2 A 1 . <
seq1 3 C 2 .^~. <<
seq1 4 T 2 .. <<
seq1 5 A 3 ..^~. <<<
seq1 6 G 4 ...^`. <<<(
seq1 7 T 4 .... <<<-
seq1 8 G 4 .... <<<&
seq1 9 G 5 ....^~. <<<-<
seq1 10 C 5 ..... <<<-<
seq1 11 T 5 ..... <<<-<
seq1 12 C 5 ..... <<<-<
seq1 13 A 7 .....^~.^~. <0<,<<<
seq1 14 T 7 ....... <<<-<<<
seq1 15 T 8 .......^~. <<<-<<<<
seq1 16 G 8 ........ ;<7-<<<<
seq1 17 T 8 ........ <<;-<<<<
seq1 18 A 9 ........^l, <67)<<;<=
-------------------------------


Thanks

Dong