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How do I add additional author names and affiliations to my paper?

The easiest way to add author affiliations is with the authblk package. If you add:

\usepackage{authblk}

to your preamble, you can then fill in the author and affiliation commands with the information you need, for example:

\author[1]{Alice Smith}
\author[2]{Bob Jones}
\affil[1]{Department of Mathematics, University X}
\affil[2]{Department of Biology, University Y}

for a paper with two authors.