typo "tag_" or "probe_" in config?

Is this driven by a physical motivation or a typo?

https://gitlab.cern.ch/cms-muonPOG/spark_tnp/-/blob/master/configs/dSAMuons_Z_official_2018.json#L23

"tag_absdxy": "abs(probe_dxy)", "tag_absdz": "abs(probe_dz)"