is this correct way of writing ?

still i have a doubt in writing for Central compartment in dynamics block

```
pk = @model begin
@param begin
tvvc ∈ RealDomain(lower=0)
tvcls ∈ RealDomain(lower=0)
tvcld ∈ RealDomain(lower=0)
tvvt ∈ RealDomain(lower=0)
tvko ∈ RealDomain(lower=0)
tvkin ∈ RealDomain(lower=0)
tvEo ∈ RealDomain(lower=0)
Ω ∈ PDiagDomain(2)
σ ∈ RealDomain(lower=0)
end
@random begin
η ~ MvNormal(Ω)
end
@pre begin
vc = tvvc * exp(η[1])
cls = tvcls * exp(η[2])
cld = tvcld
vt = tvvt
ko = tvko
kin = tvkin
Eo = tvEo
end
@init begin
Central = 0
Peripheral = 0
fAI = 1
end
@dynamics begin
Central' = (cld/vt) * Peripheral - ((1+fAI) * cls * Central/vc ) - (cld/vc) * Central
Peripheral' = (cld/vc) * Central - (cld/vt) * Peripheral
fAI' = ko * (cls*(Central/vc)- fAI)
end
@derived begin
cp = @. 1000 * Central/vc
cpheri = @. Peripheral/vt
En = @. fAI
end
end
param = (tvvc = 146, tvcls = 0.04, tvcld = 116, tvvt = 58.4,
tvko = 0.023, tvEo = 138, tvkin = 0.023,
Ω = Diagonal([0.0,0.0]), σ =0 )
```

```
dr = DosageRegimen([120,40], rate = [120,80],time=[0,8],addl =[0,8], ii =[0,8], cmt = [1,1])
sub = Subject(id=1, evs = dr)
obs = simobs(pk,sub,param,obstimes = 0:1:100)
plot(obs)
```

still the plot not showing auto induction. concentration level are increasing