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We present a new method implemented in our new package \textit{FitAik}, toperform least-squares fitting of calculated and experimental atomic transitionprobabilities, by using the mono-electronic transition integrals $\langle n\ell|r| n'\ell' \rangle$ (with $r$ the electronic radial coordinate) as adjustablequantities. \textit{FitAik} is interfaced to the Cowan suite of codes, forwhich it automatically writes input files and reads output files. We illustrateour procedure with the example of Er$^{+}$ ion, for which the agreement betweencalculated and experimental Einstein coefficients is found to be very good. Thesource code of \emph{FitAik} can be found on GitLab, and the calculatedEinstein coefficients are stored in our new database CaDDiACs. They are alsoused to calculate the dynamic dipole polarizability of Er$^+$.

FitAik: a package to calculate least-square fitted atomic transitions probabilities. Application to the Er+ lanthanide ion