AT_CHECK([pspp -O format=csv quick-pw.sps > pspp-pw.csv])
-AT_CHECK([head -n -3 pspp-s.csv > top-s.csv])
-AT_CHECK([head -n -3 pspp-pw.csv > top-pw.csv])
+AT_CHECK([head -n 18 pspp-s.csv > top-s.csv])
+AT_CHECK([head -n 18 pspp-pw.csv > top-pw.csv])
AT_CHECK([diff top-s.csv top-pw.csv])