diff --git a/diag_step_extrapolation.py b/diag_step_extrapolation.py
index e30372f..5784100 100644
--- a/diag_step_extrapolation.py
+++ b/diag_step_extrapolation.py
@@ -21,9 +21,16 @@ XTOL, MAXFEV, ACC = 1e-12, 200, 1e-6
 
 
 def halvings_of(f, lo, flo, hi, fhi, landing, r):
+    """Halvings of the bracket bought by one evaluation at `landing`.
+
+    FIXED 2026-09-21 after the first run of PREREG B printed `inf`: an exact hit makes
+    the new width 0, and the old floor (ulp of the root, 5e-324 when the root is 0)
+    overflowed W/floor.  An exact hit ends the run, so it is worth exactly the halvings
+    still needed to reach xtol: the floor is XTOL, the same for every candidate.  A was
+    re-run with this metric; its first numbers used the old floor."""
     W = hi - lo
     Wn = bracket_step(f, lo, flo, hi, fhi, landing)
-    return math.log2(W / max(Wn, math.ulp(r) if r != 0.0 else 5e-324))
+    return math.log2(W / max(Wn, XTOL)) if W > XTOL else 0.0
 
 
 def replay(f, a, b, r, cfg):
diff --git a/results_diag_A_B_fixed_metric.txt b/results_diag_A_B_fixed_metric.txt
new file mode 100644
index 0000000..3beecd4
--- /dev/null
+++ b/results_diag_A_B_fixed_metric.txt
@@ -0,0 +1,30 @@
+######## A (fixed metric)
+
+== proposed (projection)
+   group            states    S>0 A lands out paired n   ours  step A  bisect   (bracket halvings per eval)
+   APS                1408  48.9%       23.1%      530   6.32    8.49    1.07
+   CHA fun1             51  64.7%       33.3%       22   6.48    8.14    1.00
+   CHA flat fun3-6    1640  87.1%        6.4%     1337   0.26    2.82    1.00
+   CHA other           177  62.1%        7.3%      102   3.74    5.20    1.00
+
+== reading (3), as for m>=2
+   group            states    S>0 A lands out paired n   ours  step A  bisect   (bracket halvings per eval)
+   APS                1103  51.3%       21.6%      444   9.00   10.44    1.09
+   CHA fun1             37  51.4%       15.8%       16   6.71   10.89    1.00
+   CHA flat fun3-6     620  68.2%       28.1%      304   0.35    0.77    0.99
+   CHA other           129  52.7%       14.7%       58   6.31    8.30    1.00
+######## B (fixed metric)
+
+== proposed (projection)
+   group            states  B bisects    ours       B   (bracket halvings per eval, all states with a decision)
+   APS                1258      65.6%    4.74    2.49
+   CHA fun1             46      60.9%    4.74    2.12
+   CHA flat fun3-6    1623      83.6%    0.31    0.97
+   CHA other           165      73.3%    3.91    1.60
+
+== reading (3), as for m>=2
+   group            states  B bisects    ours       B   (bracket halvings per eval, all states with a decision)
+   APS                 958      52.6%    5.52    2.12
+   CHA fun1             32      43.8%    4.52    1.31
+   CHA flat fun3-6     603      48.3%    0.58    0.82
+   CHA other           120      46.7%    5.22    2.03
diff --git a/results_diag_outcome_memory.txt b/results_diag_outcome_memory.txt
new file mode 100644
index 0000000..7d8b584
--- /dev/null
+++ b/results_diag_outcome_memory.txt
@@ -0,0 +1,14 @@
+
+== proposed (projection)
+   group            states  B bisects    ours       B   (bracket halvings per eval, all states with a decision)
+   APS                1258      65.6%     inf     inf
+   CHA fun1             46      60.9%    5.44    2.17
+   CHA flat fun3-6    1623      83.6%    0.32    0.98
+   CHA other           165      73.3%    4.88    2.03
+
+== reading (3), as for m>=2
+   group            states  B bisects    ours       B   (bracket halvings per eval, all states with a decision)
+   APS                 958      52.6%    7.46    2.69
+   CHA fun1             32      43.8%    5.01    1.52
+   CHA flat fun3-6     603      48.3%    0.59    0.83
+   CHA other           120      46.7%    6.59    2.72