diff --git a/libsrc/meshing/improve3.cpp b/libsrc/meshing/improve3.cpp
index 2ef1dd5f..6c7d7511 100644
--- a/libsrc/meshing/improve3.cpp
+++ b/libsrc/meshing/improve3.cpp
@@ -2245,7 +2245,7 @@ double MeshOptimize3d :: SwapImproveEdge (Mesh & mesh, OPTIMIZEGOAL goal,
           bad2 += 1e4;
 
 
-      if (goal == OPT_CONFORM && bad2 < 1e4)
+      if (goal == OPT_CONFORM && NotTooBad(bad1, bad2))
         {
           INDEX_3 face(pi3, pi4, pi5);
           face.Sort();
@@ -2253,8 +2253,7 @@ double MeshOptimize3d :: SwapImproveEdge (Mesh & mesh, OPTIMIZEGOAL goal,
             {
               // (*testout) << "3->2 swap, could improve conformity, bad1 = " << bad1
               //				 << ", bad2 = " << bad2 << endl;
-              if (bad2 < 1e4)
-                  bad1 = 2 * bad2;
+                bad2 = bad1 + IMPROVEMENT_CONFORMING_EDGE;
             }
         }
 
@@ -2650,6 +2649,9 @@ double MeshOptimize3d :: SwapImproveEdge (Mesh & mesh, OPTIMIZEGOAL goal,
       if (confface != -1)
           bestl = confface;
 
+      if(confface != -1 || confedge != -1)
+          badopt = bad1 + IMPROVEMENT_CONFORMING_EDGE;
+
       if (bestl != -1)
         {
           // (*mycout) << nsuround << "->" << 2 * (nsuround-2) << " " << flush;
diff --git a/tests/pytest/compare_results.py b/tests/pytest/compare_results.py
index 82f578e6..ed2c2dca 100644
--- a/tests/pytest/compare_results.py
+++ b/tests/pytest/compare_results.py
@@ -12,8 +12,10 @@ def readData(a, files):
     ne1d=[]
     ne2d=[]
     ne3d=[]
+    file=[]
     for f in files:
         for t in a[f]:
+            file.append(f)
             if t['ne1d']>0:
                 ne1d.append(t['ne1d'])
             if t['ne2d']>0:
@@ -37,6 +39,7 @@ def readData(a, files):
             "#edges" : ne1d,
             "#trigs" : ne2d,
             "#tets" : ne3d,
+            "file" : file,
             }
 
 import matplotlib.pyplot as plt
@@ -61,6 +64,15 @@ filenames = [f for f in s if f in s2]
 data = readData(s, filenames)
 data2 = readData(s2, filenames)
 
+assert(len(data) == len(data2))
+
+for bad1,bad2, f1, f2 in zip(data['badness'], data2['badness'], data['file'], data2['file']):
+    assert f1==f2
+    if bad2>0 and bad2>1.1*bad1:
+        print(f"file {f1} got worse:  {bad1} -> {bad2}")
+    if bad2>0 and bad2<0.9*bad1:
+        print(f"file {f1} got better: {bad1} -> {bad2}")
+
 n = len(data)+1
 fig,ax = plt.subplots(figsize=(10,7))
 for i,d in enumerate(['min trig angle','min tet angle','max trig angle','max tet angle']):
diff --git a/tests/pytest/results.json b/tests/pytest/results.json
index aff178db..161dd1ea 100644
--- a/tests/pytest/results.json
+++ b/tests/pytest/results.json
@@ -486,9 +486,9 @@
             ],
             "ne1d": 134,
             "ne2d": 160,
-            "ne3d": 245,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 25, 37, 40, 42, 43, 30, 15, 3, 2]",
-            "total_badness": 349.09002466
+            "ne3d": 244,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 25, 35, 41, 42, 42, 31, 15, 4, 2]",
+            "total_badness": 346.48816749
         },
         {
             "angles_tet": [
@@ -501,9 +501,9 @@
             ],
             "ne1d": 190,
             "ne2d": 282,
-            "ne3d": 589,
-            "quality_histogram": "[0, 0, 0, 0, 2, 0, 0, 5, 2, 13, 40, 46, 62, 105, 90, 94, 60, 46, 20, 4]",
-            "total_badness": 862.89134979
+            "ne3d": 584,
+            "quality_histogram": "[0, 0, 0, 0, 2, 0, 1, 5, 2, 15, 44, 43, 59, 99, 94, 91, 62, 43, 21, 3]",
+            "total_badness": 858.49088107
         },
         {
             "angles_tet": [
@@ -1290,7 +1290,7 @@
         },
         {
             "angles_tet": [
-                16.097,
+                14.707,
                 160.17
             ],
             "angles_trig": [
@@ -1300,8 +1300,8 @@
             "ne1d": 104,
             "ne2d": 152,
             "ne3d": 124,
-            "quality_histogram": "[0, 0, 0, 0, 10, 19, 39, 26, 9, 3, 1, 1, 5, 1, 3, 2, 3, 2, 0, 0]",
-            "total_badness": 353.53219387
+            "quality_histogram": "[0, 0, 0, 1, 8, 21, 38, 26, 9, 3, 1, 1, 5, 1, 3, 2, 3, 2, 0, 0]",
+            "total_badness": 354.28790114
         },
         {
             "angles_tet": [
@@ -1444,7 +1444,7 @@
     "frame.step": [
         {
             "angles_tet": [
-                2.8491,
+                2.9086,
                 171.1
             ],
             "angles_trig": [
@@ -1453,39 +1453,39 @@
             ],
             "ne1d": 10108,
             "ne2d": 29958,
-            "ne3d": 152591,
-            "quality_histogram": "[0, 3, 1, 3, 8, 19, 67, 166, 526, 1268, 2848, 5750, 10287, 16353, 21624, 25759, 26679, 22815, 14557, 3858]",
-            "total_badness": 201926.65352
+            "ne3d": 152461,
+            "quality_histogram": "[0, 3, 1, 3, 6, 18, 51, 153, 539, 1234, 2814, 5708, 10236, 16240, 21696, 25712, 26711, 22859, 14609, 3868]",
+            "total_badness": 201603.34124
         },
         {
             "angles_tet": [
                 2.296,
-                175.61
+                175.72
             ],
             "angles_trig": [
-                2.0087,
-                175.57
+                3.4731,
+                146.28
             ],
             "ne1d": 5988,
             "ne2d": 10976,
-            "ne3d": 29065,
-            "quality_histogram": "[3, 4, 3, 11, 16, 45, 110, 221, 664, 978, 1581, 2526, 3121, 3891, 4274, 4114, 3456, 2388, 1312, 347]",
-            "total_badness": 43056.520137
+            "ne3d": 28875,
+            "quality_histogram": "[3, 4, 4, 9, 16, 45, 103, 213, 662, 993, 1514, 2528, 3069, 3888, 4348, 4102, 3364, 2352, 1334, 324]",
+            "total_badness": 42759.274327
         },
         {
             "angles_tet": [
-                2.171,
+                2.1678,
                 174.11
             ],
             "angles_trig": [
                 1.6035,
-                174.13
+                150.55
             ],
             "ne1d": 9622,
             "ne2d": 23596,
-            "ne3d": 80062,
-            "quality_histogram": "[2, 15, 4, 18, 14, 35, 84, 189, 432, 1005, 2118, 4194, 7190, 10267, 12556, 13449, 12163, 9311, 5588, 1428]",
-            "total_badness": 110028.28336
+            "ne3d": 79955,
+            "quality_histogram": "[2, 15, 2, 17, 16, 36, 79, 196, 428, 1003, 2107, 4194, 7142, 10182, 12517, 13476, 12277, 9263, 5564, 1439]",
+            "total_badness": 109848.90296
         }
     ],
     "hinge.stl": [
@@ -1500,24 +1500,24 @@
             ],
             "ne1d": 456,
             "ne2d": 1212,
-            "ne3d": 1997,
-            "quality_histogram": "[0, 0, 0, 0, 0, 2, 3, 13, 16, 45, 74, 128, 187, 237, 290, 279, 264, 264, 149, 46]",
-            "total_badness": 2785.3969831
+            "ne3d": 1985,
+            "quality_histogram": "[0, 0, 0, 0, 0, 3, 3, 11, 21, 48, 78, 121, 177, 243, 281, 291, 257, 267, 140, 44]",
+            "total_badness": 2774.8392965
         },
         {
             "angles_tet": [
-                7.7862,
+                7.6058,
                 161.84
             ],
             "angles_trig": [
                 9.6143,
-                148.89
+                152.14
             ],
             "ne1d": 298,
             "ne2d": 610,
-            "ne3d": 789,
-            "quality_histogram": "[0, 0, 1, 10, 9, 4, 22, 15, 40, 43, 68, 84, 103, 96, 83, 85, 48, 49, 25, 4]",
-            "total_badness": 1364.9012739
+            "ne3d": 785,
+            "quality_histogram": "[0, 0, 2, 11, 6, 6, 19, 18, 36, 45, 66, 84, 102, 91, 81, 82, 51, 54, 26, 5]",
+            "total_badness": 1354.028297
         },
         {
             "angles_tet": [
@@ -1525,14 +1525,14 @@
                 164.51
             ],
             "angles_trig": [
-                12.656,
-                152.72
+                12.725,
+                144.55
             ],
             "ne1d": 370,
             "ne2d": 850,
-            "ne3d": 1124,
-            "quality_histogram": "[0, 0, 1, 1, 7, 6, 14, 27, 38, 52, 69, 112, 142, 138, 163, 145, 96, 62, 43, 8]",
-            "total_badness": 1789.6525041
+            "ne3d": 1123,
+            "quality_histogram": "[0, 0, 1, 1, 7, 6, 15, 27, 38, 52, 69, 112, 144, 138, 162, 142, 96, 62, 43, 8]",
+            "total_badness": 1791.0009554
         },
         {
             "angles_tet": [
@@ -1540,29 +1540,29 @@
                 156.97
             ],
             "angles_trig": [
-                21.175,
-                135.02
+                21.769,
+                131.54
             ],
             "ne1d": 516,
             "ne2d": 1570,
-            "ne3d": 2567,
-            "quality_histogram": "[0, 0, 0, 0, 0, 4, 3, 5, 22, 47, 97, 152, 226, 318, 382, 403, 346, 303, 207, 52]",
-            "total_badness": 3558.447444
+            "ne3d": 2603,
+            "quality_histogram": "[0, 0, 0, 0, 0, 4, 3, 5, 24, 49, 99, 162, 236, 315, 392, 410, 338, 298, 213, 55]",
+            "total_badness": 3617.4946271
         },
         {
             "angles_tet": [
                 19.878,
-                145.14
+                146.81
             ],
             "angles_trig": [
-                22.16,
-                131.22
+                21.108,
+                133.01
             ],
             "ne1d": 722,
             "ne2d": 2856,
-            "ne3d": 6740,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 1, 3, 20, 38, 63, 161, 381, 636, 854, 1077, 1143, 1240, 851, 272]",
-            "total_badness": 8654.5076132
+            "ne3d": 6742,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 1, 2, 22, 37, 55, 164, 381, 655, 846, 1080, 1151, 1213, 867, 268]",
+            "total_badness": 8659.2800224
         },
         {
             "angles_tet": [
@@ -1900,9 +1900,9 @@
             ],
             "ne1d": 248,
             "ne2d": 2320,
-            "ne3d": 16409,
-            "quality_histogram": "[0, 0, 0, 0, 0, 4, 20, 55, 119, 192, 288, 630, 958, 1489, 2106, 2552, 2926, 2613, 1913, 544]",
-            "total_badness": 21635.781365
+            "ne3d": 16407,
+            "quality_histogram": "[0, 0, 0, 0, 0, 4, 20, 55, 118, 191, 287, 630, 956, 1497, 2097, 2550, 2936, 2608, 1913, 545]",
+            "total_badness": 21630.784432
         },
         {
             "angles_tet": [
@@ -2015,18 +2015,18 @@
     "part1.stl": [
         {
             "angles_tet": [
-                14.209,
-                147.23
+                13.063,
+                147.22
             ],
             "angles_trig": [
                 19.94,
-                127.49
+                119.28
             ],
             "ne1d": 170,
             "ne2d": 448,
-            "ne3d": 1261,
-            "quality_histogram": "[0, 0, 0, 0, 0, 1, 3, 8, 15, 25, 35, 78, 97, 157, 211, 199, 161, 144, 100, 27]",
-            "total_badness": 1752.4668505
+            "ne3d": 1232,
+            "quality_histogram": "[0, 0, 0, 0, 0, 1, 3, 7, 14, 22, 38, 66, 91, 150, 218, 198, 155, 156, 86, 27]",
+            "total_badness": 1707.0143419
         },
         {
             "angles_tet": [
@@ -2039,14 +2039,14 @@
             ],
             "ne1d": 134,
             "ne2d": 286,
-            "ne3d": 529,
-            "quality_histogram": "[0, 0, 0, 2, 4, 2, 4, 5, 13, 31, 36, 45, 51, 81, 71, 56, 62, 43, 20, 3]",
-            "total_badness": 824.2762646
+            "ne3d": 509,
+            "quality_histogram": "[0, 0, 0, 2, 4, 3, 5, 5, 18, 25, 33, 48, 51, 64, 72, 65, 52, 30, 24, 8]",
+            "total_badness": 798.54900393
         },
         {
             "angles_tet": [
-                19.623,
-                148.63
+                19.624,
+                148.62
             ],
             "angles_trig": [
                 19.446,
@@ -2054,29 +2054,29 @@
             ],
             "ne1d": 194,
             "ne2d": 590,
-            "ne3d": 1629,
-            "quality_histogram": "[0, 0, 0, 0, 0, 1, 1, 2, 7, 11, 31, 56, 119, 210, 240, 245, 292, 235, 140, 39]",
-            "total_badness": 2170.2820961
+            "ne3d": 1631,
+            "quality_histogram": "[0, 0, 0, 0, 0, 1, 1, 2, 7, 15, 35, 54, 127, 203, 240, 247, 285, 232, 144, 38]",
+            "total_badness": 2179.4995302
         },
         {
             "angles_tet": [
-                21.731,
-                138.73
+                20.545,
+                150.39
             ],
             "angles_trig": [
-                24.944,
-                119.75
+                23.604,
+                120.32
             ],
             "ne1d": 266,
             "ne2d": 980,
-            "ne3d": 4128,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 1, 1, 5, 20, 83, 161, 326, 494, 640, 851, 800, 593, 153]",
-            "total_badness": 5188.8712057
+            "ne3d": 4061,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 1, 1, 2, 5, 30, 78, 131, 284, 527, 619, 852, 827, 552, 152]",
+            "total_badness": 5098.4284907
         },
         {
             "angles_tet": [
-                21.099,
-                146.09
+                20.783,
+                146.42
             ],
             "angles_trig": [
                 24.61,
@@ -2084,9 +2084,9 @@
             ],
             "ne1d": 674,
             "ne2d": 6832,
-            "ne3d": 82647,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 1, 4, 17, 101, 396, 1391, 3605, 7593, 12586, 17573, 19510, 15047, 4823]",
-            "total_badness": 99991.989263
+            "ne3d": 82637,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 1, 4, 17, 97, 397, 1390, 3595, 7583, 12590, 17553, 19516, 15071, 4823]",
+            "total_badness": 99971.30166
         }
     ],
     "period.geo": [
@@ -2107,18 +2107,18 @@
         },
         {
             "angles_tet": [
-                12.301,
-                162.28
+                10.254,
+                166.55
             ],
             "angles_trig": [
                 14.767,
-                140.96
+                144.13
             ],
             "ne1d": 160,
             "ne2d": 280,
-            "ne3d": 601,
-            "quality_histogram": "[0, 0, 0, 0, 3, 6, 10, 21, 33, 57, 65, 81, 72, 40, 61, 53, 34, 48, 13, 4]",
-            "total_badness": 1021.3669479
+            "ne3d": 581,
+            "quality_histogram": "[0, 0, 1, 1, 4, 8, 17, 22, 29, 58, 59, 78, 67, 40, 55, 45, 32, 46, 16, 3]",
+            "total_badness": 1019.9118615
         },
         {
             "angles_tet": [
@@ -2193,54 +2193,54 @@
             ],
             "ne1d": 886,
             "ne2d": 2528,
-            "ne3d": 8236,
-            "quality_histogram": "[5, 8, 33, 42, 41, 52, 40, 53, 84, 115, 226, 410, 616, 890, 1226, 1335, 1291, 1015, 601, 153]",
-            "total_badness": 12202.367974
+            "ne3d": 8259,
+            "quality_histogram": "[5, 8, 29, 42, 47, 53, 42, 53, 86, 127, 234, 422, 649, 869, 1201, 1333, 1280, 1021, 605, 153]",
+            "total_badness": 12253.881955
         },
         {
             "angles_tet": [
-                1.181,
+                1.1793,
                 174.03
             ],
             "angles_trig": [
-                2.5404,
-                170.0
+                4.4862,
+                152.74
             ],
             "ne1d": 570,
             "ne2d": 1126,
-            "ne3d": 1625,
-            "quality_histogram": "[3, 23, 42, 49, 57, 79, 92, 122, 133, 143, 160, 125, 136, 136, 122, 67, 62, 43, 27, 4]",
-            "total_badness": 4132.7009693
+            "ne3d": 1585,
+            "quality_histogram": "[4, 28, 40, 51, 57, 65, 84, 108, 127, 145, 155, 131, 141, 135, 112, 71, 58, 49, 20, 4]",
+            "total_badness": 4116.4289328
         },
         {
             "angles_tet": [
                 1.1,
-                172.16
+                172.17
             ],
             "angles_trig": [
-                2.2863,
-                165.88
+                3.2068,
+                163.66
             ],
             "ne1d": 724,
             "ne2d": 1662,
-            "ne3d": 3079,
-            "quality_histogram": "[2, 13, 28, 54, 52, 45, 53, 71, 110, 127, 187, 249, 337, 394, 368, 357, 294, 200, 113, 25]",
-            "total_badness": 5638.801451
+            "ne3d": 3087,
+            "quality_histogram": "[2, 15, 30, 56, 49, 41, 55, 69, 99, 124, 187, 257, 341, 403, 358, 368, 297, 206, 109, 21]",
+            "total_badness": 5672.1029809
         },
         {
             "angles_tet": [
                 1.2152,
-                169.91
+                165.67
             ],
             "angles_trig": [
                 1.1526,
-                158.98
+                152.31
             ],
             "ne1d": 956,
             "ne2d": 2742,
-            "ne3d": 8675,
-            "quality_histogram": "[3, 11, 40, 47, 45, 52, 53, 57, 84, 132, 177, 326, 500, 771, 1187, 1468, 1538, 1257, 742, 185]",
-            "total_badness": 12664.774403
+            "ne3d": 8640,
+            "quality_histogram": "[3, 10, 38, 48, 47, 55, 52, 55, 83, 138, 177, 324, 506, 776, 1201, 1406, 1497, 1301, 722, 201]",
+            "total_badness": 12611.933258
         },
         {
             "angles_tet": [
@@ -2253,9 +2253,9 @@
             ],
             "ne1d": 1554,
             "ne2d": 6276,
-            "ne3d": 30191,
-            "quality_histogram": "[2, 8, 13, 8, 27, 48, 54, 67, 94, 163, 310, 595, 1224, 2288, 3706, 5135, 6007, 5525, 3828, 1089]",
-            "total_badness": 39089.872515
+            "ne3d": 30128,
+            "quality_histogram": "[2, 8, 13, 8, 26, 47, 54, 67, 97, 161, 296, 601, 1218, 2303, 3660, 5126, 5976, 5561, 3809, 1095]",
+            "total_badness": 38992.872327
         },
         {
             "angles_tet": [
@@ -2268,9 +2268,9 @@
             ],
             "ne1d": 2992,
             "ne2d": 23260,
-            "ne3d": 281899,
-            "quality_histogram": "[4, 10, 11, 10, 10, 23, 27, 58, 100, 257, 753, 2012, 5557, 13696, 27894, 44772, 59147, 64039, 48573, 14946]",
-            "total_badness": 344505.69105
+            "ne3d": 281849,
+            "quality_histogram": "[4, 10, 11, 10, 9, 25, 27, 57, 103, 264, 751, 2013, 5565, 13730, 27855, 44729, 59205, 63981, 48551, 14949]",
+            "total_badness": 344465.16205
         }
     ],
     "revolution.geo": [
@@ -2377,9 +2377,9 @@
             ],
             "ne1d": 400,
             "ne2d": 1390,
-            "ne3d": 2336,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 2, 54, 79, 137, 200, 257, 265, 306, 286, 263, 221, 140, 104, 22]",
-            "total_badness": 3622.1771287
+            "ne3d": 2335,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 2, 55, 79, 134, 196, 259, 266, 307, 287, 261, 222, 141, 104, 22]",
+            "total_badness": 3618.6672084
         },
         {
             "angles_tet": [
@@ -2398,8 +2398,8 @@
         },
         {
             "angles_tet": [
-                20.122,
-                143.27
+                20.14,
+                143.25
             ],
             "angles_trig": [
                 23.794,
@@ -2407,9 +2407,9 @@
             ],
             "ne1d": 666,
             "ne2d": 4792,
-            "ne3d": 31253,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 2, 5, 23, 101, 240, 652, 1499, 3037, 4927, 6557, 7202, 5289, 1719]",
-            "total_badness": 38131.596693
+            "ne3d": 31261,
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 0, 2, 6, 21, 103, 237, 651, 1503, 3041, 4906, 6579, 7204, 5289, 1719]",
+            "total_badness": 38140.005778
         }
     ],
     "sculpture.geo": [
@@ -2425,8 +2425,8 @@
             "ne1d": 192,
             "ne2d": 410,
             "ne3d": 475,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 2, 3, 7, 11, 21, 29, 61, 75, 95, 88, 43, 27, 12, 1]",
-            "total_badness": 694.76962476
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 1, 3, 7, 12, 22, 31, 60, 75, 93, 89, 42, 27, 12, 1]",
+            "total_badness": 695.03425262
         },
         {
             "angles_tet": [
@@ -2470,8 +2470,8 @@
             "ne1d": 192,
             "ne2d": 410,
             "ne3d": 475,
-            "quality_histogram": "[0, 0, 0, 0, 0, 0, 2, 3, 7, 11, 21, 29, 61, 75, 95, 88, 43, 27, 12, 1]",
-            "total_badness": 694.76962627
+            "quality_histogram": "[0, 0, 0, 0, 0, 0, 1, 3, 7, 12, 22, 31, 60, 75, 93, 89, 42, 27, 12, 1]",
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             "angles_tet": [
@@ -3161,13 +3161,13 @@
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+            "total_badness": 7464.5609796
         },
         {
             "angles_tet": [
-                8.0938,
-                167.14
+                8.1301,
+                160.14
             ],
             "angles_trig": [
                 7.7605,
@@ -3175,14 +3175,14 @@
             ],
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+            "quality_histogram": "[0, 0, 3, 8, 13, 39, 84, 122, 123, 153, 169, 133, 139, 114, 88, 88, 55, 37, 12, 2]",
+            "total_badness": 2771.9730366
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         {
             "angles_tet": [
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-                164.55
+                8.6612,
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                 14.15,
@@ -3190,9 +3190,9 @@
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+            "quality_histogram": "[0, 0, 0, 3, 9, 17, 46, 71, 120, 145, 191, 205, 314, 382, 341, 234, 138, 87, 46, 24]",
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@@ -3205,9 +3205,9 @@
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@@ -3220,9 +3220,9 @@
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-            "total_badness": 23125.468501
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         {
             "angles_tet": [
@@ -3516,4 +3516,4 @@
             "total_badness": 16428.083882
         }
     ]
-}
+}
\ No newline at end of file