How to make dataframe from output of loop

General Usage
2

please at least read the “getting started” part of the documentation:
https://dataframes.juliadata.org/stable/man/getting_started/#Constructing-Column-by-Column

julia> a = 0:160;

julia> conc = 1.05*exp.(-0.0228 .* a);

julia> df = DataFrame(; a, conc)
161×2 DataFrame
 Row │ a      conc
     │ Int64  Float64
─────┼──────────────────
   1 │     0  1.05
   2 │     1  1.02633
...
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