diff --git a/mpl/sw-trend1.py b/mpl/sw-trend1.py
index 1885e44..0cd8b83 100644
--- a/mpl/sw-trend1.py
+++ b/mpl/sw-trend1.py
@@ -281,7 +281,7 @@ class SlidingWindow:
         """
         n, cdt, last = tick
         max_distance = self.bias
-        segment_added = False
+        rc = None
         self.xs.append(cdt)
         self.ys.append(last)
         x0, y0 = (self.xs[0], self.ys[0])
@@ -290,7 +290,7 @@ class SlidingWindow:
             self.segx.append(x0)
             self.segy.append(y0)
         if len(self.xs) < 2:
-            return (self.segx, self.segy, segment_added)
+            return None
         # check distance
         coefs = interpolate_line((x0, x1), (y0, y1))
         ip_ys = np.polyval(coefs, self.xs)
@@ -311,10 +311,11 @@ class SlidingWindow:
             # slope of current segment 
             x0, y0 = (self.xs[0], self.ys[0])
             b1, a1 = interpolate_line((x0, x1), (y0, y1))
-            self.add_type(b0, b1)
-        return (self.segx + [x1], self.segy + [y1], segment_added)
+            lohi = self.get_type(b0, b1)
+            rc = (x2, y2, lohi)
+        return (self.segx + [x1], self.segy + [y1], rc)
 
-    def add_type(self, b0, b1):
+    def get_type(self, b0, b1):
         """ calculate gearing
         y: previous slope, x: current slope
             <0 ~0 >0
@@ -323,30 +324,26 @@ class SlidingWindow:
         >0  H  H  H
         """
         if b0 < -SMALL and b1 < -SMALL and b0 > b1:
-            type = "H"
-        elif b0 < -SMALL and b1 < -SMALL and b0 < b1:
-            type = "L"
-        elif b0 < -SMALL and abs(b1) < SMALL:
-            type = "L"
+            lohi = "d+" 
+        elif b0 < -SMALL and b1 < SMALL and b0 < b1:
+            lohi = "d-" 
         elif b0 < -SMALL and b1 > SMALL:
-            type = "L"
+            lohi = "L"
         elif abs(b0) < SMALL and b1 < -SMALL:
-            type = "H"
+            lohi = "d+"
         elif abs(b0) < SMALL and abs(b1) < SMALL:
-            type = "0"
+            lohi = "0"
         elif abs(b0) < SMALL and b1 > SMALL:
-            type = "L"
+            lohi = "u+"
         elif b0 > SMALL and b1 < -SMALL:
-            type = "H"
-        elif b0 > SMALL and abs(b1) < SMALL:
-            type = "H"
-        elif b0 > SMALL and b1 > SMALL and b0 > b1:
-            type = "H"
+            lohi = "H"
+        elif b0 > SMALL and b1 > -SMALL and b0 > b1:
+            lohi = "u-"
         elif b0 > SMALL and b1 > SMALL and b0 < b1:
-            type = "L"
+            lohi = "u+"
         else:
-            type = "?"
-        self.types.append(type)
+            lohi = "?"
+        return lohi
 
 
 SMALL = 1E-10
@@ -401,7 +398,7 @@ class Main:
 
         # create artists
         LOG.debug("Loading ticks...")
-        self.xs, self.ys, self.vs = tdl(datetime.datetime(2009, 7, 3))
+        self.xs, self.ys, self.vs = tdl(datetime.datetime(2009, 7, 2))
         LOG.debug("Ticks loaded.")
         lows, highs = find_lows_highs(self.xs, self.ys)
         self.mas = self.ys[:]
@@ -511,27 +508,33 @@ class Main:
     def mark_segments(self, n):
         x = self.xs
         y = self.ys
-        segx, segy, seg_add = self.osw((n, x[n], y[n]))
-        self.seg.set_data(segx, segy)
-        if seg_add:
-            text = self.osw.types[-1]
-            if text == "H":
-                fc = "green"
-                dy = +15
-            elif text == "L":
-                fc = "red"
-                dy = -15
-            else:
-                fc = "blue"
-                dy = +15
-            self.ax1.annotate(text,
-                        xy=(segx[-2], segy[-2]),
-                        xytext=(segx[-1], segy[-2]+dy),
-                        arrowprops=dict(facecolor=fc,
-                                          frac=0.3,
-                                          shrink=0.1))
-            
-            
+        rc = self.osw((n, x[n], y[n]))
+        if rc is not None:
+            segx, segy, lohi = rc 
+            self.seg.set_data(segx, segy)
+            if lohi is not None:
+                text = lohi[2]
+                if text == "u+":
+                    fc = "blue"
+                    dy = -15
+                elif text == "d+":
+                    fc = "blue"
+                    dy = +15
+                elif text == "H":
+                    fc = "green"
+                    dy = +15
+                elif text == "L":
+                    fc = "red"
+                    dy = -15
+                else:
+                    fc = None
+                if fc:
+                    self.ax1.annotate(text,
+                                xy=(lohi[0], lohi[1]),
+                                xytext=(segx[-1], segy[-2]+dy),
+                                arrowprops=dict(facecolor=fc,
+                                                  frac=0.3,
+                                                  shrink=0.1))
         
     def mark_low_high(self, n):
         x = self.xs