It depends. A severe wrong edge is a -2 or -3 GOE and the final GOE awarded has to be negative.
A unclear edge takeoff is only a -1 or -2 GOE subtracted from any positive GOE earned on a jump/combo. The final GOE is not required to be negative for minor flutzes. In theory you could flutz a combo and earn +3 GOE before the deduction and still finish the jump with +2 GOE. I've looked at a lot of protocols this year and I've never seen any actual (e) call with a positive GOE. It should be noted that a flutz doesn't neccasarily even show up on the protocols. By that I mean the tech panel can call a flutz and not put an (e) on the scoresheet. So it's possible they call a 3ltz-3t but put (no sign) on the protocols and the jump earns +1 and no one knows any deduction happened but in fact it may have and that jump could have been a +2 since (no sign) calls are simply a -1 reduction to GOE and NOT required to be negative. (This confuses me to no end )
We can't forget that the final scores per element are an average of seven judges so you'll see flutzes often awarded -.30 or -.60 on the protocols. Factored by 7.
http://www.usfsa.org/content/2013-14 S&P Establishing GOE.pdf
The third page here describes all deductions and which ones are required to have a negative GOE and the ones that can still be positive in the end.
I'm sorry I know you're a Julia fan, and this is the judges fault and not hers just to make it clear, but she was given a +1 by a certain judge on the 3lz-2t at sochi during her fs with an e call. But it seems an e call last season might also mean an unclear edge take off.. So confusing.