# What unit of measurement is GV?

I am reading this paper; at page 12, it saids:

Lockwood et al. (1986) found that the recovery time was independent of rigidity in the range ~ 2 to ~ 5 GV

what is GV? I thought that rigidity was measured in T m (Tesla meter).

$P = \frac{pc}{q}$
where q is the charge of the particle. If pc is electron volts, then q is the number of electronic charge units and P is in volts. Convenient units are MV ($10^6$ V) and GV ($10^9$ V.
Note that a factor of $c$ was added to the over-the-line 'momentum' to give it energy units.