Apply suggestions from code review

Co-authored-by: Chad Mitchell <[email protected]>

docs/source/dataanalysis/dataanalysis.rst

@@ -70,13 +70,13 @@ The code writes out the values in an ASCII file prefixed ``reduced_beam_characte
 * ``s``, ``ref_beta_gamma``
     Reference particle coordinate ``s`` (unit: meter) and relativistic momentum normalized by the particle mass and the speed of light (unit: dimensionless)
 * ``x_mean/min/max``, ``y_mean/min/max``, ``t_mean/min/max``
-    Average / minimum / maximum beam particle displacement with respect to the reference particle in the dimensions of ``x``, ``y`` (transverse coordinates, unit: meter), and ``t`` (normalized time difference :math:`ct`, unit: meter)
+    Average / minimum / maximum particle displacement with respect to the reference particle in the dimensions of ``x``, ``y`` (transverse coordinates, unit: meter), and ``t`` (normalized time difference :math:`ct`, unit: meter)
 * ``sig_x``, ``sig_y``, ``sig_t``
     RMS of the average beam particle positions (unit: meter)
 * ``px_mean/min/max``, ``py_mean/min/max``, ``pt_mean/min/max``
-    Average / minimum / maximum beam momentum deviation from the reference momenta and normalized by the longitudinal reference particle momentum (unit: dimensionless, radians for transverse momenta)
+    Average / minimum / maximum particle momentum deviation from the reference particle momentum, divided by the magnitude of the reference particle momentum (unit: dimensionless, radians for transverse momenta)
 * ``sig_px``, ``sig_py``, ``sig_pt``
-    RMS of the average beam momentum deviations (energy difference for ``pt``) normalized by the longitudinal reference particle momentum (unit: dimensionless)
+    Standard deviation of the particle momentum deviations (energy difference for ``pt``) normalized by the magnitude of the reference particle momentum (unit: dimensionless)
 * ``emittance_x``, ``emittance_y``, ``emittance_t``
     Normalized beam emittance (unit: meter)
 * ``alpha_x``, ``alpha_y``, ``alpha_t``