diff --git a/VERSION b/VERSION
index 3dbd46e..c7119f1 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.288
+1.0.289
diff --git a/sky130/custom/scripts/add_bipolar_ids.py b/sky130/custom/scripts/add_bipolar_ids.py
index 872af9b..611cc71 100755
--- a/sky130/custom/scripts/add_bipolar_ids.py
+++ b/sky130/custom/scripts/add_bipolar_ids.py
@@ -10,6 +10,7 @@
 import os
 import re
 import sys
+import tempfile
 
 options = []
 arguments = []
@@ -50,7 +51,6 @@
 
 for idx, device in enumerate(devlist):
     infile_name = magpath + '/' + device + '.mag'
-    outfile_name = magpath + '/' + device + '_temp.mag'
 
     if not os.path.exists(infile_name):
         print('Error:  Cannot find file ' + infile_name)
@@ -61,7 +61,8 @@
     type = typelist[idx]
     is_baserect = False
     infile = open(infile_name, 'r')
-    outfile = open(outfile_name, 'w')
+    handle, outfile_name = tempfile.mkstemp()
+    outfile = os.fdopen(handle, 'w')
     line_number = 0
     replaced_something = False
 
diff --git a/sky130/custom/scripts/fix_spice_includes.py b/sky130/custom/scripts/fix_spice_includes.py
index f70079b..8469057 100755
--- a/sky130/custom/scripts/fix_spice_includes.py
+++ b/sky130/custom/scripts/fix_spice_includes.py
@@ -11,6 +11,7 @@
 import os
 import re
 import sys
+import tempfile
 
 newdevs = []
 newdevs.append('sky130_fd_pr__pnp_05v5_W3p40L3p40')
@@ -38,10 +39,10 @@
     filepath = os.path.split(infile_name)[0]
     filename = os.path.split(infile_name)[1]
     fileroot = os.path.split(filename)[0]
-    outfile_name = os.path.join(filepath, fileroot + '_temp')
 
     infile = open(infile_name, 'r')
-    outfile = open(outfile_name, 'w')
+    handle, outfile_name = tempfile.mkstemp()
+    outfile = os.fdopen(handle, 'w')
 
     line_number = 0
     replaced_something = False
diff --git a/sky130/custom/scripts/mismatch_params.py b/sky130/custom/scripts/mismatch_params.py
index af84ddc..c8a8fef 100755
--- a/sky130/custom/scripts/mismatch_params.py
+++ b/sky130/custom/scripts/mismatch_params.py
@@ -9,6 +9,7 @@
 import os
 import re
 import sys
+import tempfile
 
 mm_switch_param = 'MC_MM_SWITCH'
 
@@ -95,10 +96,10 @@
     filepath = os.path.split(infile_name)[0]
     filename = os.path.split(infile_name)[1]
     fileroot = os.path.splitext(filename)[0]
-    outfile_name = os.path.join(filepath, fileroot + '_temp')
 
     infile = open(infile_name, 'r')
-    outfile = open(outfile_name, 'w')
+    handle, outfile_name = tempfile.mkstemp()
+    outfile = os.fdopen(handle, 'w')
 
     state = 'before_mismatch'
     line_number = 0
diff --git a/sky130/custom/scripts/montecarlo_hack.py b/sky130/custom/scripts/montecarlo_hack.py
index f2486ce..81a47aa 100755
--- a/sky130/custom/scripts/montecarlo_hack.py
+++ b/sky130/custom/scripts/montecarlo_hack.py
@@ -11,6 +11,7 @@
 import os
 import re
 import sys
+import tempfile
 
 searchpath = ['sky130A/libs.tech/ngspice/parameters/critical.spice',
 	'sky130A/libs.tech/ngspice/parameters/montecarlo.spice']
@@ -54,10 +55,10 @@
     filepath = os.path.split(infile_name)[0]
     filename = os.path.split(infile_name)[1]
     fileroot = os.path.splitext(filename)[0]
-    outfile_name = os.path.join(filepath, fileroot + '_temp')
 
     infile = open(infile_name, 'r')
-    outfile = open(outfile_name, 'w')
+    handle, outfile_name = tempfile.mkstemp()
+    outfile = osfdopen(handle, 'w')
 
     line_number = 0
     replaced_something = False
diff --git a/sky130/custom/scripts/process_params.py b/sky130/custom/scripts/process_params.py
index d255c41..657a635 100755
--- a/sky130/custom/scripts/process_params.py
+++ b/sky130/custom/scripts/process_params.py
@@ -9,6 +9,7 @@
 import os
 import re
 import sys
+import tempfile
 
 pr_switch_param = 'MC_PR_SWITCH'
 
@@ -86,10 +87,10 @@
     filepath = os.path.split(infile_name)[0]
     filename = os.path.split(infile_name)[1]
     fileroot = os.path.splitext(filename)[0]
-    outfile_name = os.path.join(filepath, fileroot + '_temp')
 
     infile = open(infile_name, 'r')
-    outfile = open(outfile_name, 'w')
+    handle, outfile_name = tempfile.mkstemp()
+    outfile = os.fdopen(handle, 'w')
 
     state = 'before_process'
     line_number = 0
diff --git a/sky130/custom/scripts/sp_to_spice.py b/sky130/custom/scripts/sp_to_spice.py
index 3c9ed3c..b97e7d5 100755
--- a/sky130/custom/scripts/sp_to_spice.py
+++ b/sky130/custom/scripts/sp_to_spice.py
@@ -54,14 +54,14 @@
             tokens = newline.split()
             if tokens[1] == filebits[0]:  # top subckt
                 bus_start = 2
-                last_base = base_rex.match(tokens[2])[1]
+                last_base = base_rex.match(tokens[2]).group(1)
                 i = 3
                 while i < len(tokens):
                     base_match = base_rex.match(tokens[i])  # always matches one base net
-                    if last_base != base_match[1]:
+                    if last_base != base_match.group(1):
                         tokens[bus_start:i] = tokens[i-1:bus_start-1:-1]  # reverse the bus indices
                         bus_start = i
-                        last_base = base_match[1]
+                        last_base = base_match.group(1)
                     i += 1
                 tokens[bus_start:i] = tokens[i-1:bus_start-1:-1]
                 newline = " ".join(tokens)
diff --git a/sky130/custom/scripts/xyce_hack.py b/sky130/custom/scripts/xyce_hack.py
index ecedb7d..6fcc914 100755
--- a/sky130/custom/scripts/xyce_hack.py
+++ b/sky130/custom/scripts/xyce_hack.py
@@ -12,6 +12,7 @@
 import os
 import re
 import sys
+import tempfile
 
 if len(sys.argv) <= 1:
     print('Usage: xyce_hack.py <path_to_file>')
@@ -23,10 +24,10 @@
     filepath = os.path.split(infile_name)[0]
     filename = os.path.split(infile_name)[1]
     fileroot = os.path.splitext(filename)[0]
-    outfile_name = os.path.join(filepath, fileroot + '_temp')
 
     infile = open(infile_name, 'r')
-    outfile = open(outfile_name, 'w')
+    handle, outfile_name = tempfile.mkstemp()
+    outfile = os.fdopen(handle, 'w')
 
     line_number = 0
     replaced_something = False
diff --git a/sky130/custom/scripts/xyce_hack2.py b/sky130/custom/scripts/xyce_hack2.py
index 9308dad..9442ad5 100755
--- a/sky130/custom/scripts/xyce_hack2.py
+++ b/sky130/custom/scripts/xyce_hack2.py
@@ -10,6 +10,7 @@
 import os
 import re
 import sys
+import tempfile
 
 plist = ["ldif", "hdif", "rd", "rs", "rsc", "rdc", "nqsmod"]
 regexps = []
@@ -26,10 +27,10 @@
     filepath = os.path.split(infile_name)[0]
     filename = os.path.split(infile_name)[1]
     fileroot = os.path.splitext(filename)[0]
-    outfile_name = os.path.join(filepath, fileroot + '_temp')
 
     infile = open(infile_name, 'r')
-    outfile = open(outfile_name, 'w')
+    handle, outfile_name = tempfile.mkstemp()
+    outfile = os.fdopen(handle, 'w')
 
     line_number = 0
     replaced_something = False
diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index 86140a8..304b4e4 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -467,7 +467,7 @@
 
   psub		pwell
 
-  obstypes	obswell,obsactive,obsli,obsmcon,obsm1,obsm2,obsm3,obsm4,obsm5,obsmrdl,obscomment
+  obstypes	obswell,mvobsactive,obsactive,obsli,obsmcon,obsm1,obsm2,obsm3,obsm4,obsm5,obsmrdl,obscomment
   idtypes	res0p35,res0p69,res1p41,res2p85,res5p73,pnp0p68,pnp3p40,npn1p00,npn2p00,npn11p0
   blocktypes	fillblock,fillblock4
   
@@ -5405,8 +5405,7 @@
 
 #n-well
 # NOTE:  This value not found in PEX files
-defaultareacap     nwell well 120
-defaultoverlap     nwell well isosub dwell  120
+defaultareacap     nwell well dnwell dwell 120
 
 #n-active 
 # Rely on device models to capture *ndiff area cap
@@ -5426,19 +5425,17 @@
 # defaultareacap     allpolynonfet active  106
 # defaultperimeter   allpolynonfet active   57
 
- defaultsidewall    *poly active  22.6
- defaultoverlap	    *poly active dnwell,isosub	     dwell 55.27
- defaultareacap     *poly active nwell,obswell,pwell well  106.13
- defaultperimeter   *poly active nwell,obswell,pwell well  55.27
- defaultsideoverlap *poly active nwell,obswell,pwell well  55.27
+ defaultsidewall    *poly active 22.6
+ defaultareacap     *poly active 106.13
+ defaultperimeter   *poly active 55.27
+ defaultsideoverlap *poly active nwell,pwell well  55.27
 
 #locali
- defaultsidewall    allli locali       32.51
- defaultoverlap	    allli locali dnwell,isosub	     dwell 36.99
- defaultareacap     allli locali nwell,obswell,pwell well  36.99
- defaultperimeter   allli locali nwell,obswell,pwell well  40.70
- defaultoverlap     allli locali nwell,obswell,pwell well  36.99
- defaultsideoverlap allli locali nwell,obswell,pwell well  40.70
+ defaultsidewall    allli locali 32.51
+ defaultareacap     allli locali 36.99
+ defaultperimeter   allli locali 40.70
+ defaultoverlap     allli locali nwell,pwell well  36.99
+ defaultsideoverlap allli locali nwell,pwell well  40.70
 
 #locali->diff
  defaultoverlap     allli locali allactivenonfet active 36.99
@@ -5450,12 +5447,11 @@
  defaultsideoverlap *poly active allli locali 25.14
 
 #metal1
- defaultsidewall    allm1 metal1      44.74
- defaultoverlap	    allm1 metal1 dnwell,isosub	     dwell 25.78
- defaultareacap     allm1 metal1 nwell,obswell,pwell well  25.78
- defaultperimeter   allm1 metal1 nwell,obswell,pwell well  40.57
- defaultoverlap     allm1 metal1 nwell,obswell,pwell well  25.78
- defaultsideoverlap allm1 metal1 nwell,obswell,pwell well  40.57
+ defaultsidewall    allm1 metal1 44.74
+ defaultareacap     allm1 metal1 25.78
+ defaultperimeter   allm1 metal1 40.57
+ defaultoverlap     allm1 metal1 nwell,pwell well  25.78
+ defaultsideoverlap allm1 metal1 nwell,pwell well  40.57
 
 #metal1->diff
  defaultoverlap     allm1 metal1 allactivenonfet active 25.78
@@ -5478,11 +5474,10 @@
 # For ReRAM, all parasitics account for the additional 0.295um between
 # metal1 and metal2
 
- defaultoverlap	    allm2 metal2 dnwell,isosub	     dwell 14.77
- defaultareacap     allm2 metal2 nwell,obswell,pwell well 14.77
- defaultperimeter   allm2 metal2 nwell,obswell,pwell well 32.92
- defaultoverlap     allm2 metal2 nwell,obswell,pwell well 14.77
- defaultsideoverlap allm2 metal2 nwell,obswell,pwell well 32.92
+ defaultareacap     allm2 metal2 14.77
+ defaultperimeter   allm2 metal2 32.92
+ defaultoverlap     allm2 metal2 nwell,pwell well 14.77
+ defaultsideoverlap allm2 metal2 nwell,pwell well 32.92
 
 #metal2->diff
  defaultoverlap     allm2 metal2 allactivenonfet active 14.77
@@ -5504,11 +5499,10 @@
  defaultsideoverlap allm1 metal1 allm2 metal2 23.03
 
 #else (!RERAM)
- defaultoverlap	    allm2 metal2 dnwell,isosub	     dwell 16.94
- defaultareacap     allm2 metal2 nwell,obswell,pwell well 16.94
- defaultperimeter   allm2 metal2 nwell,obswell,pwell well 37.76
- defaultoverlap     allm2 metal2 nwell,obswell,pwell well 16.94
- defaultsideoverlap allm2 metal2 nwell,obswell,pwell well 37.76
+ defaultareacap     allm2 metal2 16.94
+ defaultperimeter   allm2 metal2 37.76
+ defaultoverlap     allm2 metal2 nwell,pwell well 16.94
+ defaultsideoverlap allm2 metal2 nwell,pwell well 37.76
 
 #metal2->diff
  defaultoverlap     allm2 metal2 allactivenonfet active 16.94
@@ -5535,11 +5529,10 @@
  defaultsidewall    allm3 metal3     63.15
 
 #ifdef RERAM
- defaultoverlap	    allm3 metal3 dnwell,isosub	     dwell 11.19
- defaultareacap     allm3 metal3 nwell,obswell,pwell well 11.19
- defaultperimeter   allm3 metal3 nwell,obswell,pwell well 37.07
- defaultoverlap     allm3 metal3 nwell,obswell,pwell well 11.19
- defaultsideoverlap allm3 metal3 nwell,obswell,pwell well 37.07
+ defaultareacap     allm3 metal3 11.19
+ defaultperimeter   allm3 metal3 37.07
+ defaultoverlap     allm3 metal3 nwell,pwell well 11.19
+ defaultsideoverlap allm3 metal3 nwell,pwell well 37.07
 
 #metal3->diff
  defaultoverlap     allm3 metal3 allactive active 11.19
@@ -5561,11 +5554,10 @@
  defaultsideoverlap allm1 metal1 allm3 metal3 20.83
 
 #else (!RERAM)
- defaultoverlap	    allm3 metal3 dnwell,isosub	     dwell 12.37
- defaultareacap     allm3 metal3 nwell,obswell,pwell well 12.37
- defaultperimeter   allm3 metal3 nwell,obswell,pwell well 40.99
- defaultoverlap     allm3 metal3 nwell,obswell,pwell well 12.37
- defaultsideoverlap allm3 metal3 nwell,obswell,pwell well 40.99
+ defaultareacap     allm3 metal3 12.37
+ defaultperimeter   allm3 metal3 40.99
+ defaultoverlap     allm3 metal3 nwell,pwell well 12.37
+ defaultsideoverlap allm3 metal3 nwell,pwell well 40.99
 
 #metal3->diff
  defaultoverlap     allm3 metal3 allactive active 12.37
@@ -5595,14 +5587,12 @@
 
 #ifdef METAL5
 #metal4
- defaultsidewall    allm4 metal4       67.33
+ defaultsidewall    allm4 metal4 67.33
 #ifdef RERAM
-# defaultareacap     alltopm metal4 well  7.84
- defaultoverlap	    allm4 metal4 dnwell,isosub	     dwell 7.84
- areacap     	    allm4/m4 7.84
- defaultperimeter   allm4 metal4 nwell,obswell,pwell well 34.17
- defaultoverlap     allm4 metal4 nwell,obswell,pwell well 7.84
- defaultsideoverlap allm4 metal4 nwell,obswell,pwell well 34.17
+ defaultareacap     allm4 metal4 7.84
+ defaultperimeter   allm4 metal4 34.17
+ defaultoverlap     allm4 metal4 nwell,pwell well 7.84
+ defaultsideoverlap allm4 metal4 nwell,pwell well 34.17
 
 #metal4->diff
  defaultoverlap     allm4 metal4 allactivenonfet active 7.84
@@ -5624,12 +5614,10 @@
  defaultsideoverlap allm1 metal1 allm4 metal4 14.54
 
 #else (!RERAM)
-# defaultareacap     alltopm metal4 well  8.42
- defaultoverlap	    allm4 metal4 dnwell,isosub	     dwell 8.42
- areacap     	    allm4/m4 8.42
- defaultperimeter   allm4 metal4 nwell,obswell,pwell well 36.68
- defaultoverlap     allm4 metal4 nwell,obswell,pwell well 8.42
- defaultsideoverlap allm4 metal4 nwell,obswell,pwell well 36.68
+ defaultareacap     allm4 metal4 8.42
+ defaultperimeter   allm4 metal4 36.68
+ defaultoverlap     allm4 metal4 nwell,pwell well 8.42
+ defaultsideoverlap allm4 metal4 nwell,pwell well 36.68
 
 #metal4->diff
  defaultoverlap     allm4 metal4 allactivenonfet active 8.42
@@ -5663,14 +5651,12 @@
  defaultsideoverlap allm3 metal3 allm4 metal4 42.64
 
 #metal5
- defaultsidewall    allm5 metal5       127.06
+ defaultsidewall    allm5 metal5 127.06
 #ifdef RERAM
-# defaultareacap     allm5 metal5 well  5.99
- defaultoverlap	    allm5 metal5 dnwell,isosub	     dwell 5.99
- areacap     	    allm5/m5 5.99
- defaultoverlap     allm5 metal5 nwell,obswell,pwell well  5.99
- defaultperimeter   allm5 metal5 nwell,obswell,pwell well  36.83
- defaultsideoverlap allm5 metal5 nwell,obswell,pwell well  36.83
+ defaultareacap     allm5 metal5 5.99
+ defaultoverlap     allm5 metal5 5.99
+ defaultperimeter   allm5 metal5 nwell,pwell well  36.83
+ defaultsideoverlap allm5 metal5 nwell,pwell well  36.83
 
 #metal5->diff
  defaultoverlap     allm5 metal5 allactivenonfet active 5.99
@@ -5692,12 +5678,10 @@
  defaultsideoverlap allm1 metal1 allm5 metal5 11.12
 
 #else (!RERAM)
-# defaultareacap     allm5 metal5 well  6.32
- defaultoverlap	    allm5 metal5 dnwell,isosub	     dwell 6.32
- areacap     	    allm5/m5 6.32
- defaultoverlap     allm5 metal5 nwell,obswell,pwell well  6.32
- defaultperimeter   allm5 metal5 nwell,obswell,pwell well  38.85
- defaultsideoverlap allm5 metal5 nwell,obswell,pwell well  38.85
+ defaultareacap     allm5 metal5 6.32
+ defaultperimeter   allm5 metal5 38.85
+ defaultoverlap     allm5 metal5 nwell,pwell well  6.32
+ defaultsideoverlap allm5 metal5 nwell,pwell well  38.85
 
 #metal5->diff
  defaultoverlap     allm5 metal5 allactivenonfet active 6.32