Modified the FOM generation to make the fill density of FOM fill
closer to 45% (about 10% below the maximum allowed density).
diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index e68cad4..f0683f4 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -1808,7 +1808,7 @@
# FOM and POLY fill
#---------------------------------------------------
templayer fomfill_pass1 topbox
- slots 0 4080 1320 0 4080 1320 1360 0
+ slots 0 4080 1600 0 4080 1600 1360 0
and-not obstruct_fom
and topbox
shrink 2035