diff --git a/toolbox/math/bst_opticalflow.m b/toolbox/math/bst_opticalflow.m
index 22bbbbbcb..a6af69a43 100644
--- a/toolbox/math/bst_opticalflow.m
+++ b/toolbox/math/bst_opticalflow.m
@@ -23,7 +23,7 @@
 % For more information type "brainstorm license" at command prompt.
 % =============================================================================@
 %
-% Authors: Julien Lef�vre, 2006-2010
+% Authors: Julien Lefevre, 2006-2010
 %          Syed Ashrafulla, 2010
 
 % INPUTS
@@ -44,7 +44,7 @@
 
 %/---Script Authors---------------------\
 %|                                      | 
-%|   *** J.Lef�vre, PhD                 |  
+%|   *** J.Lefevre, PhD                 |  
 %|   julien.lefevre@chups.jussieu.fr    |
 %|                                      | 
 %\--------------------------------------/
@@ -53,12 +53,12 @@
 Faces = FV.Faces; Vertices = FV.Vertices; VertNormals = FV.VertNormals;
 nVertices = size(Vertices,1); % VertNormals = FV.VertNormals';
 nFaces = size(Faces,1);
-tStartIndex = find(Time < tStart-eps, 1, 'last')+1; % Index of first time point for flow calculation
+tStartIndex = find(Time < tStart-100*eps, 1, 'last')+1; % Index of first time point for flow calculation
 if isempty(tStartIndex)
     [tmp, tStartIndex] = min(Time);
     tStartIndex = tStartIndex + 1;
 end
-tEndIndex = find(Time < tEnd-eps, 1, 'last')+1; % Index of last time point for flow calculation
+tEndIndex = find(Time < tEnd-100*eps, 1, 'last')+1; % Index of last time point for flow calculation
 if isempty(tEndIndex)
     [tmp, tEndIndex] = max(Time);
     tEndIndex = tEndIndex + 1;