diff --git a/xga/sourcetools/mass.py b/xga/sourcetools/mass.py
index e52a9ea4..ed85ae06 100644
--- a/xga/sourcetools/mass.py
+++ b/xga/sourcetools/mass.py
@@ -1,5 +1,5 @@
 #  This code is a part of X-ray: Generate and Analyse (XGA), a module designed for the XMM Cluster Survey (XCS).
-#  Last modified by David J Turner (turne540@msu.edu) 30/07/2024, 17:14. Copyright (c) The Contributors
+#  Last modified by David J Turner (turne540@msu.edu) 17/01/2025, 15:42. Copyright (c) The Contributors
 
 from typing import Union, List
 from warnings import warn
@@ -147,7 +147,7 @@ def inv_abel_dens_onion_temp(sources: Union[GalaxyCluster, ClusterSample], outer
                     rads = t_prof.radii.copy()[1:]
                     rad_errs = t_prof.radii_err.copy()[1:]
                     deg_rads = src.convert_radius(rads, 'deg')
-                    hy_mass = HydrostaticMass(t_prof, t_model, d_prof, d_model, rads, rad_errs, deg_rads, fit_method,
+                    hy_mass = HydrostaticMass(t_prof, d_prof, t_model, d_model, rads, rad_errs, deg_rads, fit_method,
                                               num_walkers, num_steps, show_warn=show_warn, progress=False,
                                               auto_save=True)
                     # Add the profile to the source storage structure