How to create aimvecs?

[axf]

Does anybody here know, how to create aimvecs? For example, for HLH we have
hlh_addvec <SEQUENCE> <f> <h> <r>. What do <f>, <h> and <r> stand for?

[randomjester]

<f> = Forward (in / out - from nose to back of head)
<h> = Height (up / down - from feet to head)
<r> = Right (left / right - from left to right side of head)

A value for each creates 1 aim point.

Example: hlh_addvec 0 10 17 2
0 = standing aimvec (standing target)
10 = <f> = Forward (in / out - from nose to back of head)
17 = <h> = Height (up / down - from feet to head)
2 = <r> = Right (left / right - from left to right side of head)

I believe that's how its suppose to be. Though, I'm going by the css way.