diff --git a/Metallicity_Stack_Commons/column_names.py b/Metallicity_Stack_Commons/column_names.py
index 6ef6681..7f4e720 100644
--- a/Metallicity_Stack_Commons/column_names.py
+++ b/Metallicity_Stack_Commons/column_names.py
@@ -5,3 +5,6 @@
 indv_names0 = ['ID', 'R23', 'O32']
 
 bin_mzevolve_names0 = ['logM_min', 'logM_max', 'logM_avg', 'logLHb', 'logLHb_min', 'logLHb_max']
+
+bin_zcalbase_names0 = ['logR23_min', 'logR23_max', 'logR23_avg', 'logO32_min', 'logO32_max', 'logO32_avg']
+