How to convert the formula from LME4 to NLME?

Hi all,

We have the following fomular in LME4:

 > (fm9 <- lmer(Reaction ~ 1 + Days + (1|Subject) + (0+Days|Subject),
+ sleepstudy, REML = 0))

How to do the same in NLME?

Thanks a lot!

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