birth cloud dust attenuation applied beyond dust_tesc

I ran into the following issue regarding the birth cloud dust attenuation:

I'm running StellarPopulation with dust_tesc=7.0, which I think means that only stellar populations with age < 1e7 should be affected by birth cloud dust attenuation. However, I find that when birth cloud dust attenuation is applied to stellar populations with age 1.1e7.

Below is an illustration. I generate spectra for a stellar population with tage=1.1e7. In one of the spectra, I set dust1 = 0.9; in the other I set dust1=0. Since tage > dust_tesc, I didn't expect there to be a difference between the two spectra but the figure below shows a significant difference.

I find that for dust_tesc=7.0, birth cloud dust attenuation is applied up to tage=1.12e7yr

Commencez par le traitement de dust_tesc et dust1 dans StellarPopulation, puis reproduisez le cas signalé avec tage=1.1e7 et dust_tesc=7.0 en comparant dust1=0.9 à dust1=0. La tâche est terminée lorsque l’atténuation du nuage de naissance ne modifie plus les spectres pour les âges au-delà du seuil configuré, avec une couverture du comportement à la limite signalé.