diff --git a/npm/examples/extract.tcl b/npm/examples/extract.tcl
index ff06746e..642cb715 100644
--- a/npm/examples/extract.tcl
+++ b/npm/examples/extract.tcl
@@ -14,14 +14,13 @@ load /work/__CELL__
 
 # Write all intermediate files to /work/ so ext2spice can find __CELL__.res.ext
 extract path /work
+extract do resistance
 extract all
 
 # extresist requires a valid box cursor; span the full layout to be safe
-box 0 0 100000 100000
-extresist all
+select top cell
 ext2spice format ngspice
 ext2spice extresist on
 ext2spice cthresh 0
-ext2spice rthresh 0
 
 ext2spice /work/__CELL__