diff --git a/docs/julia/lc2ppik-lhcb-2683025.qmd b/docs/julia/lc2ppik-lhcb-2683025.qmd
index 60912f7..cb82d26 100644
--- a/docs/julia/lc2ppik-lhcb-2683025.qmd
+++ b/docs/julia/lc2ppik-lhcb-2683025.qmd
@@ -36,30 +36,6 @@ theme(:wong2, frame=:box, grid=false, minorticks=true,
     lab="")
 ```
 
-## Function definitions
-
-The model contains non-standard lineshapes that do not conform to a simple `BreitWigner` or `MultichannelBreitWigner` distribution, so they have to be defined explicitly.
-The code below defines a new lineshape and implements its deserialization method (specializing `dict2instance()` using [multiple dispatch](https://docs.julialang.org/en/v1/manual/methods/#man-method-specializations)).
-
-```{julia}
-struct BreitWignerWidthExpLikeBugg <: HadronicLineshapes.AbstractFlexFunc
-    m::Float64
-    Γ::Float64
-    γ::Float64
-end
-function (BW::BreitWignerWidthExpLikeBugg)(σ::Number)
-    mK = 0.493677
-    mπ = 0.13957018
-    σA = mK^2 - mπ^2 / 2
-    @unpack m, Γ, γ = BW
-    Γt = (σ - σA) / (m^2 - σA) * Γ * exp(-γ * σ)
-    1 / (m^2 - σ - 1im * m * Γt)
-end
-function ThreeBodyDecaysIO.dict2instance(::Type{BreitWignerWidthExpLikeBugg}, dict)
-    @unpack mass, width, slope, x = dict
-    return NamedArgFunc(BreitWignerWidthExpLikeBugg(mass, width, slope), [x])
-end
-```
 
 ## Deserialization of Objects to a Workspace
 
diff --git a/models/lc2ppik-lhcb-2683025.json b/models/lc2ppik-lhcb-2683025.json
index 0828a43..c95fefc 100644
--- a/models/lc2ppik-lhcb-2683025.json
+++ b/models/lc2ppik-lhcb-2683025.json
@@ -865,19 +865,13 @@
     },
     {
       "name": "K700_BuggBW",
-      "slope": 0.94106,
-      "type": "BreitWignerWidthExpLikeBugg",
-      "x": "m_23_sq",
-      "mass": 0.824,
-      "width": 0.478
+      "type": "generic_function",
+      "expression": "1/(0.824^2 - σ - i * 0.824 * (σ - 0.23397706275638377) / (0.824^2 - 0.23397706275638377) * 0.478 * exp(-0.941060 * σ))"
     },
     {
       "name": "K1430_BuggBW",
-      "slope": 0.020981,
-      "type": "BreitWignerWidthExpLikeBugg",
-      "x": "m_23_sq",
-      "mass": 1.375,
-      "width": 0.19
+      "type": "generic_function",
+      "expression": "1/(1.375^2 - σ - i * 1.375 * (σ - 0.23397706275638377) / (1.375^2 - 0.23397706275638377) * 0.190 * exp(-0.020981 * σ))"
     },
     {
       "name": "L1670_BW",