Biasing Carbon Ion

Hello Everyone

I want to bias Carbon Ions only but when I use
/SEE/biasing/biasParticle 6 12 0 0
I get a segmentation error. this issue was resolved by using
### Biasing
/SEE/biasing/biasParticle ion
/SEE/biasing/biasProcess ionInelastic
/SEE/biasing/biasFactor 1000
/SEE/biasing/biasNonPrimariesToo true
does this mean it will bias each and every ion produced or just C12? If yes, is there any way to bias only C12 rather then All of them? Thank you.

regards
Aamir