Natbib error

When compiling my papers with the PNAS options,


I would get a compilation error

! Package natbib Error: Bibliography not compatible with author-year citations.
(natbib) Press  <return> to continue in numerical citation style.
See the natbib package documentation for explanation.

that was quite minor (just press <return>!) but nonetheless annoying. This seemed to be due to the latest version of natbib. I eventually found a solution by Ulrike Fisher on this forum, namely to replace {a} with {n} in the above \bibpunct line.


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