diff --git a/rowers/dataprep.py b/rowers/dataprep.py
index 0059162f..a68e288e 100644
--- a/rowers/dataprep.py
+++ b/rowers/dataprep.py
@@ -428,7 +428,8 @@ def save_workout_database(f2,r,dosmooth=True,workouttype='rower',
     isbreakthrough = False
     if workouttype == 'water':
         delta,cpvalues,avgpower = datautils.getsinglecp(row.df)
-        if utils.isbreakthrough(delta,cpvalues,r.p0,r.p1,r.p2,r.p3,r.cpratio):
+        res,btvalues = utils.isbreakthrough(delta,cpvalues,r.p0,r.p1,r.p2,r.p3,r.cpratio)
+        if res:
             isbreakthrough = True
             res = datautils.updatecp(delta,cpvalues,r)
 
@@ -595,14 +596,16 @@ def save_workout_database(f2,r,dosmooth=True,workouttype='rower',
         if settings.DEBUG and r.getemailnotifications:
             res = handle_sendemail_breakthrough.delay(w.id,r.user.email,
                                                 r.user.first_name,
-                                                r.user.last_name)
+                                                      r.user.last_name,
+                                                      btvalues=btvalues.to_json())
         elif r.getemailnotifications:
             try:
                 res = queuehigh.enqueue(
                     handle_sendemail_breakthrough(w.id,
                                                   r.user.email,
                                                   r.user.first_name,
-                                                  r.user.last_name))
+                                                  r.user.last_name,
+                                                  btvalues=btvalues.to_json()))
             except AttributeError:
                 pass
         else:
diff --git a/rowers/datautils.py b/rowers/datautils.py
index ca4cbff1..8cdde524 100644
--- a/rowers/datautils.py
+++ b/rowers/datautils.py
@@ -77,8 +77,8 @@ def cpfit(powerdf):
 
 def getlogarr(maxt):
     maxlog10 = np.log10(maxt-5)
-    logarr = np.log10(5.)+np.arange(50)*maxlog10/50.
-    logarr = [int(10.**(la)) for la in logarr]
+    logarr = np.arange(50)*maxlog10/50.
+    logarr = [5+int(10.**(la)) for la in logarr]
     logarr = pd.Series(logarr)
     logarr.drop_duplicates(keep='first',inplace=True)
 
@@ -88,7 +88,7 @@ def getlogarr(maxt):
 def getsinglecp(df):
     thesecs = df['TimeStamp (sec)'].max()-df['TimeStamp (sec)'].min()
     if thesecs != 0:
-        maxt = 2*thesecs
+        maxt = 1.05*thesecs
     else:
         maxt = 1000.
 
@@ -152,7 +152,6 @@ def getcp(dfgrouped,logarr):
             dt = pd.Series(dt)
             cpw = pd.Series(cpw)
             if len(dt):
-            
                 cpvalues = griddata(dt.values,
                                     cpw.values,
                                     logarr,method='linear',
diff --git a/rowers/tasks.py b/rowers/tasks.py
index 50277880..9b98a4e8 100644
--- a/rowers/tasks.py
+++ b/rowers/tasks.py
@@ -52,7 +52,7 @@ def handle_new_workout_from_file(r,f2,
 @app.task
 def handle_sendemail_breakthrough(workoutid,useremail,
                                   userfirstname,userlastname,
-                                  btvalues = pd.DataFrame()):
+                                  btvalues = pd.DataFrame().to_json()):
 
     # send email with attachment
     subject = "A breakthrough workout on rowsandall.com"
@@ -63,7 +63,7 @@ def handle_sendemail_breakthrough(workoutid,useremail,
     message += " Critical Power (CP) is the power that you can "
     message += "sustain for a given duration. For more, see this "
     message += " article in the analytics blog:\n\n"
-    message += " [link to article to be written]\n\n"
+    message += " http://analytics.rowsandall.com/2017/06/17/how-do-we-calculate-critical-power/ \n\n"
     message += "Link to the workout http://rowsandall.com/rowers/workout/"
     message += str(workoutid)
     message +="/edit\n\n"
@@ -72,6 +72,9 @@ def handle_sendemail_breakthrough(workoutid,useremail,
     message += str(workoutid)
     message += "/updatecp\n\n"
 
+    btvalues = pd.read_json(btvalues)
+    btvalues.sort_values('delta',axis=0,inplace=True)
+    
     if not btvalues.empty:
         message += "These were the breakthrough values:\n" 
         for t in btvalues.itertuples():
@@ -79,9 +82,15 @@ def handle_sendemail_breakthrough(workoutid,useremail,
             cpvalue = t.cpvalues
             pwr = t.pwr
 
-            message += "Time: "+str(delta)+" seconds\n"
-            message += "New: "+str(cpvalue)+" Watt\n"
-            message += "Old: "+str(pwr)+" Watt\n\n"
+            message += "Time: {delta} seconds\n".format(
+                delta=delta
+                )
+            message += "New: {cpvalue:.0f} Watt\n".format(
+                cpvalue=cpvalue
+                )
+            message += "Old: {pwr:.0f} Watt\n\n".format(
+                pwr=pwr
+                )
 
         
     message += "To opt out of these email notifications, deselect the checkbox on your Profile page under Account Information.\n\n"
@@ -237,11 +246,11 @@ def handle_otwsetpower(f1,boattype,weightvalue,
     update_strokedata(workoutid,rowdata.df,debug=debug)
 
     delta,cpvalues,avgpower = datautils.getsinglecp(rowdata.df)
-    res,deltas =  utils.isbreakthrough(delta,cpvalues,ps[0],ps[1],ps[2],ps[3],ratio)
+    res,btvalues =  utils.isbreakthrough(delta,cpvalues,ps[0],ps[1],ps[2],ps[3],ratio)
     if res:
         handle_sendemail_breakthrough(workoutid,email,
                                       first_name,
-                                      last_name,deltas)
+                                      last_name,btvalues=btvalues.to_json())
 
     # send email
     fullemail = first_name + " " + last_name + " " + "<" + email + ">"
diff --git a/rowers/utils.py b/rowers/utils.py
index 5036dac2..6e788b7c 100644
--- a/rowers/utils.py
+++ b/rowers/utils.py
@@ -77,7 +77,6 @@ def geo_distance(lat1,lon1,lat2,lon2):
 
 
 def isbreakthrough(delta,cpvalues,p0,p1,p2,p3,ratio):
-
   pwr = p0/(1+delta/p2)
   pwr += p1/(1+delta/p3)
 
@@ -92,4 +91,8 @@ def isbreakthrough(delta,cpvalues,p0,p1,p2,p3,ratio):
       'pwr':pwr[cpvalues>pwr],
     }
   )
+
+  btdf.sort_values('delta',axis=0,inplace=True)
+
+  
   return res>1,btdf
diff --git a/rowsanda_107501 b/rowsanda_107501
index f2be9658..c0aaa646 100644
Binary files a/rowsanda_107501 and b/rowsanda_107501 differ