When using this data, please cite the original publication:

Additionally, you should cite the record:

@misc{hepdata.29829, author = "{DM2 Collaboration}", title = "{The Pion Electromagnetic Form-factor in the Timelike Energy Range 1.35-{GeV} $\le \sqrt{s} \le$ 2.4-{GeV}}", howpublished = "{HEPData (collection)}", year = 1989, note = "\url{https://doi.org/10.17182/hepdata.29829}" }

or, if you prefer, a specific version of the record:

@misc{hepdata.29829.v1, author = "{DM2 Collaboration}", title = "{The Pion Electromagnetic Form-factor in the Timelike Energy Range 1.35-{GeV} $\le \sqrt{s} \le$ 2.4-{GeV} (Version 1)}", howpublished = "{HEPData (collection)}", year = 1989, note = "\url{https://doi.org/10.17182/hepdata.29829.v1}" }

You can also cite this table directly.

@misc{hepdata.29829.v1/t1, author = "{DM2 Collaboration}", title = "{``Table 1'' of ``The Pion Electromagnetic Form-factor in the Timelike Energy Range 1.35-{GeV} $\le \sqrt{s} \le$ 2.4-{GeV}'' (Version 1)}", howpublished = "{HEPData (dataset)}", year = 1989, note = "\url{https://doi.org/10.17182/hepdata.29829.v1/t1}" }