I went to school in Arkansas about 20 years ago. We had one single choice for foreign language, and that was Spanish. Our Spanish teacher was terrible, didn’t teach us a lick of Spanish, threatened to kill the class, and even one time refused to leave during a fire drill. She threw books at students one time.

Good times.

I did some more digging, NASA has a nice little website that if you scroll down you can see some nice spectra: https://imagine.gsfc.nasa.gov/educators/lessons/xray_spectra/background-spectroscopy.html

Hard to find a solid link that isn’t paywalled (most peer reviewed work is). You can google “x-ray spectroscopy z-pinch film UNR” and check out images. Won’t look as pretty as yours, our film was black and white.

This looks exactly like some of my x-Ray spectroscopy data I studied in graduate school. Uncanny. Take a line out of this using ImageJ and analyze it!