diff --git a/debug-viewer/GstDebugViewer/GUI.py b/debug-viewer/GstDebugViewer/GUI.py
index 762254c400..1d8ae288b1 100755
--- a/debug-viewer/GstDebugViewer/GUI.py
+++ b/debug-viewer/GstDebugViewer/GUI.py
@@ -231,7 +231,6 @@ class FilteredLogModel (LogModelBase):
 
         self.parent_model = lazy_log_model
         self.ensure_cached = lazy_log_model.ensure_cached
-
         self.line_cache = lazy_log_model.line_cache
 
         self.line_offsets += lazy_log_model.line_offsets
diff --git a/debug-viewer/GstDebugViewer/Plugins/LineFrequency.py b/debug-viewer/GstDebugViewer/Plugins/LineFrequency.py
index f15ec229e4..bcf0934e88 100644
--- a/debug-viewer/GstDebugViewer/Plugins/LineFrequency.py
+++ b/debug-viewer/GstDebugViewer/Plugins/LineFrequency.py
@@ -145,6 +145,12 @@ class LineFrequencyWidget (gtk.DrawingArea):
             ctx.rectangle (position1, 0, line_width, h)
             ctx.fill ()
 
+    def find_indicative_time_step (self):
+
+        MINIMUM_PIXEL_STEP = 32
+        time_per_pixel = self.sentinel_step
+        return 32 # FIXME use self.sentinel_step and len (self.sentinel_data)
+
     def __draw (self, drawable):
 
         ctx = drawable.cairo_create ()
@@ -156,13 +162,21 @@ class LineFrequencyWidget (gtk.DrawingArea):
         ctx.new_path ()
 
         ctx.set_line_width (1.)
-        ctx.set_source_rgb (.96, .96, .96)
+        ctx.set_source_rgb (.95, .95, .95)
         for i in range (h // 16):
             y = i * 16 - .5
             ctx.move_to (0, y)
             ctx.line_to (w, y)
             ctx.stroke ()
 
+        pixel_step = self.find_indicative_time_step ()
+        ctx.set_source_rgb (.9, .9, .9)
+        for i in range (w // pixel_step):
+            x = i * pixel_step - .5
+            ctx.move_to (x, 0)
+            ctx.line_to (x, h)
+            ctx.stroke ()
+
         if self.sentinel_data is None and self.sentinel:
             if w > 15:
                 self.logger.debug ("running sentinel for width %i", w)