Haha, I forgot about IDL. My very first coding project as an undergrad was in IDL, until one day a new grad student showed up to the lab and said, "WTF? Do this

Haha, I forgot about IDL. My very first coding project as an undergrad was in IDL, until one day a new grad student showed up to the lab and said, "WTF? Do this in python." When looking at plots in papers, there are always little giveaways for what program it was made in. Plot has horizontal gridlines, but no vertical gridlines: Excel. Plot is typeset with Arial, size 4: Matlab. Plot looks like it was sent through a fax a few times: IDL.