Is there a way to get the Polynomial. jl operation `fit()`

to work in Makie.jl? I’ve tried to use the `Makie.convert_argument()`

and other iterations of it, but, maybe I’m using it incorrectly?

Here is where I left it at my last attempt:

```
agmt_dlm = readdlm("/home/rob/Documents/julia/dy_comb_tenv3/AGMT_with_decyr.tenv3")
agmt_decyr = convert(Vector{Float64}, agmt_dlm[:, 3])
agmt_Vres = convert(Vector{Float64}, agmt_dlm[:, 12])
# agmt_fit = Makie.convert_single_argument(Polynomials.fit(agmt_decyr, agmt_Vres, 2))
GLMakie.activate!()
dark_latex = merge(theme_dark(), theme_latexfonts())
with_theme(dark_latex, fontsize = 20) do
fig = Figure(size = (1200, 800))
ax1 = Axis(fig[1,1],
ylabel = "Vert Displacement",
title = "AGMT" )
CairoMakie.scatter!(convert(Vector{Float64},agmt_dlm[:, 3]),
convert(Vector{Float64},agmt_dlm[:, 6]),
markersize = 7,
color = convert(Vector{Float64}, agmt_dlm[:, 6]), colormap = :lightrainbow,
strokewidth = 0.3, strokecolor = :white)
CairoMakie.lines!(convert(Vector{Float64}, agmt_dlm[:, 3]),
convert(Vector{Float64}, agmt_dlm[:, 10]),
color = :white, linewidth = 3)
ax2 = Axis(fig[2, 1],
ylabel = "Residual Displacement")
CairoMakie.scatter!(ax2, convert(Vector{Float64}, agmt_dlm[:, 3]),
convert(Vector{Float64}, agmt_dlm[:, 12]),
markersize = 7,
color = convert(Vector{Float64}, agmt_dlm[:, 12]), colormap = :lightrainbow,
strokewidth = 0.3, strokecolor = :white)
Makie.convert_arguments(CairoMakie.lines!(ax2,Polynomials.fit(agmt_decyr, agmt_Vres, 2),
color = :white, linewidth = 3))
fig
#save("agmt_earthday.png", fig)
end
```

Here’s the error:

```
ERROR: `Makie.convert_arguments` for the plot type Lines and its conversion trait PointBased() was unsuccessful.
The signature that could not be converted was:
::Polynomial{Float64, :x}
Makie needs to convert all plot input arguments to types that can be consumed by the backends (typically Arrays with Float32 elements).
You can define a method for `Makie.convert_arguments` (a type recipe) for these types or their supertypes to make this set of arguments convertible (See http://docs.makie.org/stable/documentation/recipes/index.html).
Alternatively, you can define `Makie.convert_single_argument` for single arguments which have types that are unknown to Makie but which can be converted to known types and fed back to the conversion pipeline.
```

Which, I tried to follow, but to no avail.

I just want a white, fitted line, on my lower plot it’s naked without it.