I have obtained the spectrum energy graph of the supernova SN2019ehk in the constellation of Coma Berrinences, I have calculated and obtained the chemical elements of each peak, several of them are calcium, like this article:
Image of the spectrum energy graph
Tatsuya Nakaoka, Keiichi Maeda, et al. Calcium-rich Transient SN 2019ehk in A Star-Forming Environment: Yet Another Candidate for An Ultra-Stripped Envelope Supernova, Cornell University: 12 pages.