--- a/inst/@dataframe/summary.m
+++ b/inst/@dataframe/summary.m
@@ -38,21 +38,21 @@
         %# compute their occurences
         sidxj = hist (sidxj, min(sidxj):max(sidxj));
         
-	%# generate a column with unique values. The regexp is used to
-	%# call disp and re-format the output over many lines.
-	resuR = strjust (char (regexp (disp (char (sval)), '.*', 'match', ...
+        %# generate a column with unique values. The regexp is used to
+        %# call disp and re-format the output over many lines.
+        resuR = strjust (char (regexp (disp (char (sval)), '.*', 'match', ...
                                        'dotexceptnewline')), 'right');
         resuR = horzcat (resuR, repmat (':', size(resuR, 1), 1));
-	%# put the name above all	
-	resuR = strjust (char ([deblank(df._name{1, 2}(indi, :)); resuR]), ...
-			 'right');
-	      
+        %# put the name above all       
+        resuR = strjust (char ([deblank(df._name{1, 2}(indi, :)); resuR]), ...
+                         'right');
+              
         %# generate a column with a blank line and the values
-	resuR = horzcat (resuR, repmat (' ', size(resuR, 1), 1),
+        resuR = horzcat (resuR, repmat (' ', size(resuR, 1), 1),
                          strjust (char (' ', regexp (disp (sidxj.'), '.*', ...
-						     'match', ...
-						     'dotexceptnewline')), ...
-				  'right'),...
+                                                     'match', ...
+                                                     'dotexceptnewline')), ...
+                                  'right'),...
                          repmat (' ', size(resuR, 1), 1));
       otherwise
         s = statistics (df._data{:, indi});
@@ -65,9 +65,9 @@
         %# generate a column with a blank line and the values
         resuR = horzcat (resuR, repmat (' ', size(resuR, 1), 1),
                          strjust (char (' ', regexp (disp (s), '.*', ...
-						     'match', ...
-						     'dotexceptnewline')), ...
-				 'right'),...
+                                                     'match', ...
+                                                     'dotexceptnewline')), ...
+                                 'right'),...
                         repmat (' ', size(resuR, 1), 1));
     endswitch
     resu = horzcat_pad (resu, resuR);