diff --git a/src/msspec/calculator.py b/src/msspec/calculator.py
index 52c2f9e..6057f28 100644
--- a/src/msspec/calculator.py
+++ b/src/msspec/calculator.py
@@ -17,7 +17,7 @@
 # along with this msspec.  If not, see <http://www.gnu.org/licenses/>.
 #
 # Source file  : src/msspec/calculator.py
-# Last modified: Mon, 23 Jun 2025 13:58:23 +0200
+# Last modified: Wed, 23 Jul 2025 16:28:29 +0200
 # Committed by : Sylvain Tricot <sylvain.tricot@univ-rennes.fr>
 
 
@@ -620,7 +620,7 @@ class _PED(_MSCALCULATOR):
 
     def _get_scan(self, scan_type='theta', phi=0,
                   theta=np.linspace(-70, 70, 141), level=None,
-                  kinetic_energy=None, data=None,
+                  kinetic_energy=None, data=None, run_phagen=True,
                   malloc={}, other_parameters={}):
         LOGGER.info("Computting the %s scan...", scan_type)
         if data:
@@ -663,7 +663,8 @@ class _PED(_MSCALCULATOR):
             grp = getattr(self, grp_str)
             grp.set_parameter(param_str, v, force=True)
 
-        self.get_tmatrix()
+        if run_phagen:
+            self.get_tmatrix()
         self.run_spec(malloc)
 
         # Now load the data
diff --git a/src/msspec/parameters.py b/src/msspec/parameters.py
index 4d39824..75b149c 100644
--- a/src/msspec/parameters.py
+++ b/src/msspec/parameters.py
@@ -19,7 +19,7 @@
 # along with this msspec.  If not, see <http://www.gnu.org/licenses/>.
 #
 # Source file  : src/msspec/parameters.py
-# Last modified: Mon, 16 Jun 2025 14:42:03 +0200
+# Last modified: Wed, 23 Jul 2025 16:28:29 +0200
 # Committed by : Sylvain Tricot <sylvain.tricot@univ-rennes.fr>
 
 
@@ -1433,7 +1433,7 @@ class ScanParameters(BaseParameters):
 class CalculationParameters(BaseParameters):
     def __init__(self, global_parameters, phagen_parameters, spec_parameters):
         parameters = (
-            Parameter('RA_cutoff', types=int, limits=(0, 8), default=1,
+            Parameter('RA_cutoff', types=int, limits=(0, 8), default=2,
                       doc="""
             The Rehr-Albers cut-off parameter which controls the degree of
             sphericity introduced in the description of the basis functions