the unit of ux

[qiangyyyy]

Dear professors, could you please tell me what the unit of ux is? mc or
unitless momentum (i.e. gamma*beta)

[RemiLehe]

Thanks for your interest in openPMD-viewer.
ux is unitless (i.e. gamma*beta), as mentioned also here: https://openpmd-viewer.readthedocs.io/en/latest/api_reference/generic_interface.html#openpmd_viewer.OpenPMDTimeSeries.get_particle

[qiangyyyy]

Thank you very much for your answer.

[qiangyyyy]

Dear Professor, I still have two more questions：
1.Does gammabeta specifically refer to the Lorentz factor and the relativistic velocity, where gamm*abeta = beta / sqrt(1 - beta²)?
2.In the code ts.get_particle(['z', 'uz'], species='electrons', iteration=300, plot=True, vmax=1e12), what is the specific meaning of vmax=1e12?
Looking forward to your reply. Thank you.