diff --git a/SP2XR_toolkit.py b/SP2XR_toolkit.py
index 6a27bce..861f312 100644
--- a/SP2XR_toolkit.py
+++ b/SP2XR_toolkit.py
@@ -2005,7 +2005,7 @@ def process_pbp_parquet(dir_path_pbp, dir_path_hk,
     
     list_hist = []
     for idx, (name, group) in enumerate(ddf_pbp.groupby('BC mass bin')):
-        a, _ = process_hist_and_dist(group, 'time_lag', 'cnts_particles_for_tl_dist', 1, timelag_bins_lims, timelag_bin_ctrs, dt_str, calculate_conc=False, flow=ddf_pbp_hk['Sample Flow Controller Read (vccm)'], rho_eff=None, BC_type=None, t=1)
+        a, _ = process_hist_and_dist(group, 'time_lag_new', 'cnts_particles_for_tl_dist', 1, timelag_bins_lims, timelag_bin_ctrs, dt_str, calculate_conc=False, flow=ddf_pbp_hk['Sample Flow Controller Read (vccm)'], rho_eff=None, BC_type=None, t=1)
         a.columns = [f'BC_mass_{inc_mass_bin_ctrs[idx]:.2f}_timelag_{i:.1f}' for i in timelag_bin_ctrs]
         
         list_hist.append(a)