Reworked the THKOX (HVI) layer output generation rules;  it now
generally does the right thing, and flags problematic areas;  a few
such problematic areas are false positives.

VERSION

diff --git a/VERSION b/VERSION
index c8b4742..01c08cf 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.67
+1.0.68

sky130/magic/sky130.tech

diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index 051c7f1..31d93d7 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -962,18 +962,25 @@
 # THKOX (HVI) (includes rules NWELL 8-11 and DIFFTAP 14-26)
 #----------------------------------------------------------------
 
- templayer baseTHKOX 	*mvpsd
-	grow-min 470
-	or alldiffmv,mvvar
+ templayer thkox_area 	alldiffmv,mvvar
 	grow	185
-        bloat-all alldiffmv nwell
+	bloat-all alldiffmv nwell
+	grow 345
+	shrink 345
+
+ templayer large_ptap_mv thkox_area
+	shrink	420
+	grow	420
+
+ templayer small_ptap_mv thkox_area
+	and-not large_ptap_mv
+	# (HVI min width rule is 0.6 but CNTM min width rule is 0.84um)
+	grow-min 840
+
+ templayer baseTHKOX 	thkox_area,small_ptap_mv
 	bridge	700 600
  	grow 	345
  	shrink 	345
-	# (HVI min width rule is 0.6 but CNTM min width rule is 0.84um)
-	grow-min 840
-	# grow-min 600
-	bridge	700 600
 
  templayer extendTHKOX	baseTHKOX,CELLRING
  	grow 	345