Thanks for posting about this interesting article. We like to credit the original authors of the works we cite, so here is the relevant citation:
Park J-S, Rajan K, Ramesh R. High-carbon steel and ancient sword-making as observed in a double-edged sword from an Iron Age megalithic burial in Tamil Nadu, India. Archaeometry 62:68–80, 2020. (available online here
I have attached larger images of the sword, which appear as Figure 1 in this article and have the following description.
General appearance of the double‐edged iron sword under investigation: (a) general appearance, where arrows locate the spots from which specimens were taken for metallographic examination; (b, c) magnified view of the tip and the body, respectively; and (d, e) magnified views of the hilt.