diff --git a/README.markdown b/README.markdown
index d8a0507..46f5cd8 100644
--- a/README.markdown
+++ b/README.markdown
@@ -284,6 +284,23 @@ Google-o-meter
 
 A Google-o-meter has a few restrictions. It may only use a solid filled background and it may only have one label.
 
+Record Chart PNG file in filesystem Sample :
+--------------------------------------------
+
+Multi Lines Chart Sample :
+
+	chart = Gchart.new(	:type => 'line',
+						:title => "example title",
+						:data => [[17, 17, 11, 8, 2],[10, 20, 15, 5, 7],[2, 3, 7, 9, 12]], 
+						:line_colors => 'e0440e,e62ae5,287eec',
+						:legend => ['courbe 1','courbe 2','courbe 3'],
+						:axis_with_labels => ['x', 'y'], 
+						:axis_range => [[0,100,20], [0,20,5]],
+						:filename => "tmp/chart.png")
+			
+	# Record file in filesystem
+	chart.file
+
 try yourself
 -------------
 
diff --git a/lib/gchart.rb b/lib/gchart.rb
index deef5e4..b4b3d29 100644
--- a/lib/gchart.rb
+++ b/lib/gchart.rb
@@ -493,7 +493,7 @@ def set_axis_range
     'chxr=' + set.enum_for(:each_with_index).map do |axis_range, index|
       next nil if axis_range.nil? # ignore this axis
       min, max, step = axis_range
-      if axis_range.size > 3 || step && max && step > max # this is a full series
+      if axis_range.size >= 3 || step && max && step > max # this is a full series
         max = axis_range.compact.max
         step = nil
       end
diff --git a/spec/gchart_spec.rb b/spec/gchart_spec.rb
index d549c50..b9ded26 100644
--- a/spec/gchart_spec.rb
+++ b/spec/gchart_spec.rb
@@ -125,7 +125,11 @@
    Gchart.line(:axis_labels => [['Jan','July','Jan','July','Jan']]).include?(Gchart.jstize('chxl=0:|Jan|July|Jan|July|Jan')).should be_true
    Gchart.line(:axis_labels => [['Jan','July','Jan','July','Jan'], ['0','100'], ['A','B','C'], ['2005','2006','2007']]).include?(Gchart.jstize('chxl=0:|Jan|July|Jan|July|Jan|1:|0|100|2:|A|B|C|3:|2005|2006|2007')).should be_true
   end
-  
+
+  it "should have evenly spaced labels by default" do
+    Gchart.line(:data => [[nil, 500, 425], [425, 600, nil]], :axis_with_labels => ['x'], :axis_labels => [[1, 2, 3]]).should include('chxr=0,0,500|1,425,600')
+  end
+
   def labeled_line(options = {})
     Gchart.line({:data => @data, :axis_with_labels => 'x,y'}.merge(options))
   end