When using this data, please cite the original publication:

Additionally, you should cite the record:

@misc{hepdata.29858, author = "{OMICRON Collaboration}", title = "{Cross-section Measurement of $\pi^- p \to \pi^- \pi^+ n$ Reaction Near Threshold}", howpublished = "{HEPData (collection)}", year = 1989, note = "\url{https://doi.org/10.17182/hepdata.29858}" }

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

@misc{hepdata.29858.v1, author = "{OMICRON Collaboration}", title = "{Cross-section Measurement of $\pi^- p \to \pi^- \pi^+ n$ Reaction Near Threshold (Version 1)}", howpublished = "{HEPData (collection)}", year = 1989, note = "\url{https://doi.org/10.17182/hepdata.29858.v1}" }

You can also cite this table directly.

@misc{hepdata.29858.v1/t1, author = "{OMICRON Collaboration}", title = "{``Table 1'' of ``Cross-section Measurement of $\pi^- p \to \pi^- \pi^+ n$ Reaction Near Threshold'' (Version 1)}", howpublished = "{HEPData (dataset)}", year = 1989, note = "\url{https://doi.org/10.17182/hepdata.29858.v1/t1}" }