diff --git a/scripts/Queries/ResultsData.pm b/scripts/Queries/ResultsData.pm
index 00aae9a..4210978 100644
--- a/scripts/Queries/ResultsData.pm
+++ b/scripts/Queries/ResultsData.pm
@@ -25,6 +25,12 @@ sub query {
     # the number of injected bits.
     # For a single byte pilot (e.g., uint8 variable), the faultspace area
     # would be inflated by x8 (8 possible bits to inject).
+    #
+    # This is the inject-on-read model: only reads are injected (write
+    # faults are covered by equivalence, because a write fault only
+    # materializes if the value is read afterwards), so the write rows in
+    # the trace (and the single write row in fspgroup that BasicPruner.cc
+    # inserts) are excluded.
     my $querystring = "SELECT
 benchmark, resulttype, SUM(t.time2 - t.time1 + 1) AS faults
 FROM variant v
@@ -32,7 +38,7 @@ JOIN trace t ON v.id = t.variant_id
 JOIN fspgroup g ON g.variant_id = t.variant_id AND g.instr2 = t.instr2 AND g.data_physical_address = t.data_physical_address
 JOIN result_GenericExperimentMessage r ON r.pilot_id = g.pilot_id
 JOIN fsppilot p ON r.pilot_id = p.id
-WHERE v.variant = '$experiment'$extra
+WHERE t.accesstype = 'R' AND v.variant = '$experiment'$extra
 GROUP BY v.id, resulttype
 ORDER BY variant, benchmark, resulttype;";