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custo zener diode in LTspice

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Hi, I want to model a mmsz4681t1g diode in LTSpice.
Therefore I am trying to modify standard.dio.
If I pick up another zener, for example:
Code: 
.model BZX84C15L D(Is=.6n Rs=.5 Cjo=110p nbv=6 bv=15 Ibv=1m Vpk=15 mfg=OnSemi type=Zener)
obviously I want to modify it, but I do not understand the meaning of all the parameters. In fact, if I take the model from this link https://www.onsemi.com/pub_link/Collateral/MMSZ4681T1G.LIB, I can find Is, Rs, but not nbv for example. How do I match parameters from subcircuit to model?
Thanks.
 

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