diff --git a/rowers/interactiveplots.py b/rowers/interactiveplots.py
index fc1e88c6..057c97d0 100644
--- a/rowers/interactiveplots.py
+++ b/rowers/interactiveplots.py
@@ -2214,16 +2214,18 @@ def interactive_chart(id=0,promember=0,intervaldata = {}):
         intervaldf = pd.DataFrame(intervaldata)
         intervaldf['itime'] = intervaldf['itime']*1.e3
         intervaldf['time'] = intervaldf['itime'].cumsum()
-        intervaldf['time_r'] = intervaldf['time'] +intervaldf['itime'].shift(-1)
-        intervaldf['value'] = 10
+        intervaldf['time'] = intervaldf['time'].shift(1)
+        intervaldf.ix[0,'time'] = 0
+        intervaldf['time_r'] = intervaldf['time'] +intervaldf['itime']
+        intervaldf['value'] = 100
         mask = intervaldf['itype'] == 3
-        intervaldf.loc[mask,'value'] = 45
+        intervaldf.loc[mask,'value'] = 0
         intervaldf['bottom'] = 10
         
         intervalsource = ColumnDataSource(
             intervaldf
         )
-        
+
         plot.quad(left='time',top='value',bottom='bottom',
                   right='time_r',source=intervalsource,color='mediumvioletred',
                   y_range_name='spmax',fill_alpha=0.2,line_alpha=0.2)