diff --git a/main.py b/main.py
index c42347b..b91fffd 100644
--- a/main.py
+++ b/main.py
@@ -150,23 +150,27 @@
 
 
 # Function to compute angle between first two vectors in VECTORS
-def compute_and_format_angle(pts: List[Tuple[float, float, float]]) -> str:
-    if len(VECTORS) < 2:
-        return "Angle v1-v2: N/A"
-    (a1, b1, _, _) = VECTORS[1]
-    (a2, b2, _, _) = VECTORS[2]
+def compute_and_format_angle(
+    pts: List[Tuple[float, float, float]], vec1: int, vec2: int
+) -> str:
+
+    hstr = f"Angle v{vec1 + 1}-v{vec2 + 1} "
+    if vec1 >= len(VECTORS) or vec2 >= len(VECTORS):
+        return hstr + "N/A"
+    (a1, b1, _, _) = VECTORS[vec1]
+    (a2, b2, _, _) = VECTORS[vec2]
     p1s, p1e, p2s, p2e = pts[a1], pts[b1], pts[a2], pts[b2]
     v1 = (p1e[0] - p1s[0], p1e[1] - p1s[1], p1e[2] - p1s[2])
     v2 = (p2e[0] - p2s[0], p2e[1] - p2s[1], p2e[2] - p2s[2])
     norm1 = math.sqrt(v1[0] ** 2 + v1[1] ** 2 + v1[2] ** 2)
     norm2 = math.sqrt(v2[0] ** 2 + v2[1] ** 2 + v2[2] ** 2)
     if norm1 < 1e-9 or norm2 < 1e-9:
-        return "Angle v1-v2: N/A"
+        return hstr + "N/A"
     dot = v1[0] * v2[0] + v1[1] * v2[1] + v1[2] * v2[2]
     cos_val = max(-1.0, min(1.0, dot / (norm1 * norm2)))
     angle_rad = math.acos(cos_val)
     angle_deg = math.degrees(angle_rad)
-    return f"Angle v1-v2: {angle_deg:.2f}°"
+    return hstr + f"{angle_deg:.2f} deg"
 
 
 # Function to visualize thumb data with a slider
@@ -250,8 +254,8 @@
         arrow_labels.append(lbl)
 
     # Angle display between v1 and v2 (figure-relative text)
-    angle_text = fig.text(0.02, 0.95, "", fontsize=12, weight="bold")
-    angle_text.set_text(compute_and_format_angle(points))
+    angle_text1 = fig.text(0.02, 0.95, "", fontsize=12, weight="bold")
+    angle_text1.set_text(compute_and_format_angle(points, 0, 1))
 
     ax.set_xlabel("X")
     ax.set_ylabel("Y")
@@ -293,7 +297,7 @@
             arrow_labels[i_pair].set_position(mid_pts)
 
         # Update angle text between v1 and v2
-        angle_text.set_text(compute_and_format_angle(points))
+        angle_text1.set_text(compute_and_format_angle(points, 0, 1))
 
         ax.set_title(f"Frame {data[frame_idx].frame_number}")
         fig.canvas.draw_idle()
@@ -302,7 +306,7 @@
 
     # Button: switch view to direction from points[0] towards points[4]
     ax_button = plt.axes([0.02, 0.02, 0.1, 0.04])
-    btn_top = Button(ax_button, "P0→P4")
+    btn_top = Button(ax_button, "v4 view")
 
     def set_top_view(points):
         # Calculate direction from points[0] to points[4]