Can anyone tell me what's Weighted Vega and Parallel Vega.. and what's the difference between the two?

<t>Can someone help me out. Any suggestion would be appreciated.Traders in our bank transact Credit Default swap with Asian name Reference assets which are not traded in the market. As a result, for revaluation, the traders' rates are accepted. I know this is a definite "no no" from the control pers...