diff --git a/propka/atom.py b/propka/atom.py
index 9f219c2..ec16046 100644
--- a/propka/atom.py
+++ b/propka/atom.py
@@ -12,7 +12,6 @@ from . import hybrid36
 
 
 # Format strings that get used in multiple places (or are very complex)
-PKA_FMT = "{:6.2f}"
 PDB_LINE_FMT1 = (
     "{type:6s}{r.numb:>5d} {atom_label} {r.res_name}{r.chain_id:>2s}"
     "{r.res_num:>4d}{r.x:>12.3f}{r.y:>8.3f}{r.z:>8.3f}{r.occ:>6s}"
diff --git a/propka/conformation_container.py b/propka/conformation_container.py
index e5db3e6..2637d67 100644
--- a/propka/conformation_container.py
+++ b/propka/conformation_container.py
@@ -64,19 +64,6 @@ class ConformationContainer:
             if group:
                 self.setup_and_add_group(group)
 
-    def additional_setup_when_reading_input_file(self):
-        """Generate interaction map and charge centers."""
-        # if a group is coupled and we are reading a .propka_input file, then
-        # some more configuration might be needed
-        map_ = make_interaction_map(
-            'Covalent coupling map for {0:s}'.format(str(self)),
-            self.get_covalently_coupled_groups(),
-            lambda g1, g2: g1 in g2.covalently_coupled_groups)
-        info(map_)
-        # check if we should set a common charge centre as well
-        if self.parameters.common_charge_centre:
-            self.set_common_charge_centres()
-
     def set_common_charge_centres(self):
         """Assign charge centers to groups."""
         for system in self.get_coupled_systems(