diff --git a/itamae/mcs.py b/itamae/mcs.py
index 61704fd..b2f9dfe 100644
--- a/itamae/mcs.py
+++ b/itamae/mcs.py
@@ -46,38 +46,38 @@
 
 # mcs rates see tables 20-30 thru 20-37 of Std
 # TODO: add up table 20-44
-MCS_HT_RATES = [{20:{1:6.5,0:7.2},40:{1:13.5,0:15}},     # mcs index 0
-                {20:{1:13,0:14.4},40:{1:27,0:30}},       # mcs index 1
-                {20:{1:19.5,0:21.7},40:{1:40.5,0:45}},   # mcs index 2
-                {20:{1:26,0:28.9},40:{1:54,0:60}},       # mcs index 3
-                {20:{1:39,0:43.3},40:{1:81,0:90}},       # mcs index 4
-                {20:{1:52,0:57.8},40:{1:108,0:120}},     # mcs index 5
-                {20:{1:58.5,0:65},40:{1:121.5,0:135}},   # mcs index 6
-                {20:{1:65,0:72.2},40:{1:135,0:150}},     # mcs index 7
-                {20:{1:13,0:14.4},40:{1:27,0:30}},       # mcs index 8
-                {20:{1:26,0:28.9},40:{1:54,0:60}},       # mcs index 9
-                {20:{1:39,0:43.3},40:{1:81,0:90}},       # mcs index 10
-                {20:{1:52,0:57.8},40:{1:108,0:120}},     # mcs index 11
-                {20:{1:78,0:86.7},40:{1:162,0:180}},     # mcs index 12
-                {20:{1:104,0:115.6},40:{1:216,0:240}},   # mcs index 13
-                {20:{1:117,0:130.0},40:{1:243,0:270}},   # mcs index 14
-                {20:{1:130,0:144.4},40:{1:270,0:300}},   # mcs index 15
-                {20:{1:19.5,0:21.7},40:{1:40.5,0:45}},   # mcs index 16
-                {20:{1:39,0:43.3},40:{1:81,0:90}},       # mcs index 17
-                {20:{1:58.5,0:65},40:{1:121.5,0:135}},   # mcs index 18
-                {20:{1:78,0:86.7},40:{1:162,0:180}},     # mcs index 19
-                {20:{1:117,0:130},40:{1:243,0:270}},     # mcs index 20
-                {20:{1:156,0:173.3},40:{1:324,0:360}},   # mcs index 21
-                {20:{1:175.5,0:195},40:{1:364.5,0:405}}, # mcs index 22
-                {20:{1:195,0:216.7},40:{1:405,0:450}},   # mcs index 23
-                {20:{1:26,0:28.9},40:{1:54,0:60}},       # mcs index 24
-                {20:{1:52,0:57.8},40:{1:108,0:120}},     # mcs index 25
-                {20:{1:78,0:86.7},40:{1:162,0:180}},     # mcs index 26
-                {20:{1:104,0:115.6},40:{1:216,0:240}},   # mcs index 27
-                {20:{1:156,0:173.3},40:{1:324,0:360}},   # mcs index 28
-                {20:{1:208,0:231.1},40:{1:432,0:480}},   # mcs index 29
-                {20:{1:234,0:260},40:{1:486,0:540}},     # mcs index 30
-                {20:{1:260,0:288.9},40:{1:540,0:600}}]   # mcs index 31
+MCS_HT_RATES = [{20:{1:7.2,0:6.5},40:{1:15,0:13.5}},     # mcs index 0
+                {20:{1:14.4,0:13},40:{1:30,0:27}},       # mcs index 1
+                {20:{1:21.7,0:19.5},40:{1:45,0:40.5}},   # mcs index 2
+                {20:{1:28.9,0:26},40:{1:60,0:54}},       # mcs index 3
+                {20:{1:43.3,0:39},40:{1:90,0:81}},       # mcs index 4
+                {20:{1:57.8,0:52},40:{1:120,0:108}},     # mcs index 5
+                {20:{1:65,0:58.5},40:{1:135,0:121.5}},   # mcs index 6
+                {20:{1:72.2,0:65},40:{1:150,0:135}},     # mcs index 7
+                {20:{1:14.4,0:13},40:{1:30,0:27}},       # mcs index 8
+                {20:{1:28.9,0:26},40:{1:60,0:54}},       # mcs index 9
+                {20:{1:43.3,0:39},40:{1:90,0:81}},       # mcs index 10
+                {20:{1:57.8,0:52},40:{1:120,0:108}},     # mcs index 11
+                {20:{1:86.7,0:78},40:{1:180,0:162}},     # mcs index 12
+                {20:{1:115.6,0:104},40:{1:240,0:216}},   # mcs index 13
+                {20:{1:130.3,0:117},40:{1:270,0:243}},   # mcs index 14
+                {20:{1:144.4,0:130},40:{1:300,0:270}},   # mcs index 15
+                {20:{1:21.7,0:19.5},40:{1:45,0:40.5}},   # mcs index 16
+                {20:{1:43.3,0:39},40:{1:90,0:81}},       # mcs index 17
+                {20:{1:65,0:58.5},40:{1:135,0:121.5}},   # mcs index 18
+                {20:{1:86.7,0:78},40:{1:180,0:162}},     # mcs index 19
+                {20:{1:130,0:117},40:{1:270,0:243}},     # mcs index 20
+                {20:{1:173.3,0:156},40:{1:360,0:324}},   # mcs index 21
+                {20:{1:195,0:175.5},40:{1:405,0:364.5}}, # mcs index 22
+                {20:{1:216.7,0:195},40:{1:450,0:405}},   # mcs index 23
+                {20:{1:28.9,0:26},40:{1:60,0:54}},       # mcs index 24
+                {20:{1:57.8,0:52},40:{1:120,0:108}},     # mcs index 25
+                {20:{1:86.7,0:78},40:{1:180,0:162}},     # mcs index 26
+                {20:{1:115.6,0:104},40:{1:240,0:216}},   # mcs index 27
+                {20:{1:173.3,0:156},40:{1:360,0:324}},   # mcs index 28
+                {20:{1:231.1,0:208},40:{1:480,0:432}},   # mcs index 29
+                {20:{1:260,0:234},40:{1:540,0:486}},     # mcs index 30
+                {20:{1:288.9,0:260},40:{1:600,0:540}}]   # mcs index 31
 
 def mcs_coding(i):
     """