diff --git a/compiler/characterizer/lib.py b/compiler/characterizer/lib.py
index 525f2180..92f8b167 100644
--- a/compiler/characterizer/lib.py
+++ b/compiler/characterizer/lib.py
@@ -44,20 +44,15 @@ class lib:
     def prepare_tables(self):
         """ Determine the load/slews if they aren't specified in the config file. """
         # These are the parameters to determine the table sizes
-        #self.load_scales = np.array([0.1, 0.25, 0.5, 1, 2, 4, 8])
-        self.load_scales = np.array([0.25, 1, 4])
-        #self.load_scales = np.array([0.25, 1])
+        self.load_scales = np.array(OPTS.load_scales)
         self.load = tech.spice["dff_in_cap"]
-        self.loads = self.load_scales*self.load
-        debug.info(1,"Loads: {0}".format(self.loads))
+        self.loads = self.load_scales * self.load
+        debug.info(1, "Loads: {0}".format(self.loads))
         
-        #self.slew_scales = np.array([0.1, 0.25, 0.5, 1, 2, 4, 8])
-        self.slew_scales = np.array([0.25, 1, 8])        
-        #self.slew_scales = np.array([0.25, 1])
-        self.slew = tech.spice["rise_time"]        
-        self.slews = self.slew_scales*self.slew
-        debug.info(1,"Slews: {0}".format(self.slews))
-
+        self.slew_scales = np.array(OPTS.slew_scales)
+        self.slew = tech.spice["rise_time"]
+        self.slews = self.slew_scales * self.slew
+        debug.info(1, "Slews: {0}".format(self.slews))
         
     def create_corners(self):
         """ Create corners for characterization. """
diff --git a/compiler/example_configs/example_config_freepdk45.py b/compiler/example_configs/example_config_freepdk45.py
index f0d71d6d..9c536bc6 100644
--- a/compiler/example_configs/example_config_freepdk45.py
+++ b/compiler/example_configs/example_config_freepdk45.py
@@ -7,8 +7,11 @@ process_corners = ["TT"]
 supply_voltages = [1.0]
 temperatures = [25]
 
-route_supplies = True
+route_supplies = False
 check_lvsdrc = True
+# nominal_corners_only = True
+load_scales = [0.5, 1, 4]
+slew_scales = [0.5, 1]
 
 output_path = "temp"
 output_name = "sram_{0}_{1}_{2}".format(word_size,
diff --git a/compiler/globals.py b/compiler/globals.py
index e1bb8661..ef4816c7 100644
--- a/compiler/globals.py
+++ b/compiler/globals.py
@@ -459,17 +459,33 @@ def set_default_corner():
             OPTS.process_corners = ["TT"]
         else:
             OPTS.process_corners = tech.spice["fet_models"].keys()
+            
     if (OPTS.supply_voltages == ""):
         if OPTS.nominal_corner_only:
             OPTS.supply_voltages = [tech.spice["supply_voltages"][1]]
         else:
             OPTS.supply_voltages = tech.spice["supply_voltages"]
+            
     if (OPTS.temperatures == ""):
         if OPTS.nominal_corner_only:
             OPTS.temperatures = [tech.spice["temperatures"][1]]
         else:
             OPTS.temperatures = tech.spice["temperatures"]
-    
+
+    # Load scales are fanout multiples of the DFF input cap
+    if (OPTS.load_scales == ""):
+        if OPTS.nominal_corner_only:
+            OPTS.load_scales = [4]
+        else:
+            OPTS.load_scales = [0.25, 1, 4]
+
+    # Load scales are fanout multiples of the default spice input slew
+    if (OPTS.slew_scales == ""):
+        if OPTS.nominal_corner_only:
+            OPTS.slew_scales = [1]
+        else:
+            OPTS.slew_scales = [0.25, 1, 4]
+            
     
 def import_tech():
     """ Dynamically adds the tech directory to the path and imports it. """
diff --git a/compiler/options.py b/compiler/options.py
index 2221f85f..0f94be2b 100644
--- a/compiler/options.py
+++ b/compiler/options.py
@@ -42,6 +42,8 @@ class options(optparse.Values):
     supply_voltages = ""
     temperatures = ""
     process_corners = ""
+    load_scales = ""
+    slew_scales = ""
 
     # Size parameters must be specified by user in config file.
     # num_words = 0