diff --git a/tardis/plasma/standard_plasmas.py b/tardis/plasma/standard_plasmas.py
index b6534b17b3d..45dc82557c2 100644
--- a/tardis/plasma/standard_plasmas.py
+++ b/tardis/plasma/standard_plasmas.py
@@ -251,7 +251,10 @@ def assemble_plasma(config, model, atom_data=None):
 
     if not model.raw_isotope_abundance.empty:
         plasma_modules += isotope_properties
-        kwargs.update(isotope_abundance=model.raw_isotope_abundance)
+        isotope_abundance = model.raw_isotope_abundance.loc[
+            :, model.v_boundary_inner_index : model.v_boundary_outer_index - 1
+        ]
+        kwargs.update(isotope_abundance=isotope_abundance)
 
     kwargs["helium_treatment"] = config.plasma.helium_treatment