How are CSLIPEQ, CSLIP1 and CSLIP2 related?

Hello,

Does anybody know how Abaqus contact variables CSLIPEQ, CSLIP1 and CSLIP2 are related? I though that CSLIPEQ was the module of the other ones (CSLIPEQ =(CSLIP1 ^2 + CSLIP2 ^2)^0.5) but I see that it is not the case. So, could anyone add clarity on this topic?

Thank you!

Abaqus