diff --git a/compiler/ptx.py b/compiler/ptx.py
index 0e69ce67..ed9c8e74 100644
--- a/compiler/ptx.py
+++ b/compiler/ptx.py
@@ -63,10 +63,15 @@ class ptx(design.design):
         
         # self.spice.append("\n.SUBCKT {0} {1}".format(self.name,
         #                                              " ".join(self.pins)))
-        self.spice_device="M{{0}} {{1}} {0} m={1} w={2}u l={3}u".format(spice[self.tx_type],
-                                                                        self.mults,
-                                                                        self.tx_width,
-                                                                        drc["minwidth_poly"])
+        # Just make a guess since these will actually be decided in the layout later.
+        area_sd = 2.5*drc["minwidth_poly"]*self.tx_width
+        perimeter_sd = 2*drc["minwidth_poly"] + 2*self.tx_width
+        self.spice_device="M{{0}} {{1}} {0} m={1} w={2}u l={3}u pd={4}u ps={4}u as={5}p ad={5}p".format(spice[self.tx_type],
+                                                                                                    self.mults,
+                                                                                                    self.tx_width,
+                                                                                                    drc["minwidth_poly"],
+                                                                                                    perimeter_sd,
+                                                                                                    area_sd)
         self.spice.append("\n* ptx " + self.spice_device)
         # self.spice.append(".ENDS {0}".format(self.name))
 
diff --git a/compiler/verify/magic.py b/compiler/verify/magic.py
index 8cbf1075..b2e66aa2 100644
--- a/compiler/verify/magic.py
+++ b/compiler/verify/magic.py
@@ -124,6 +124,8 @@ def write_netgen_script(cell_name, sp_name):
     f.write("flatten class {{{0}.spice precharge_array}}\n".format(cell_name))
     f.write("property {{{0}.spice nfet}} remove as ad ps pd\n".format(cell_name))
     f.write("property {{{0}.spice pfet}} remove as ad ps pd\n".format(cell_name))
+    f.write("property {{{0} n}} remove as ad ps pd\n".format(sp_name))
+    f.write("property {{{0} p}} remove as ad ps pd\n".format(sp_name))
     # Allow some flexibility in W size because magic will snap to a lambda grid
     # This can also cause disconnects unfortunately!
     # f.write("property {{{0}{1}.spice nfet}} tolerance {{w 0.1}}\n".format(OPTS.openram_temp,