diff --git a/ex-7/plot.py b/ex-7/plot.py
index 9d4515f..40f1d26 100755
--- a/ex-7/plot.py
+++ b/ex-7/plot.py
@@ -3,7 +3,12 @@
 from pylab import *
 import sys
 
+def line(x, y, **args):
+    '''line between two points x,y'''
+    plot([x[0], y[0]], [x[1], y[1]], **args)
+
 w = loadtxt(sys.stdin, max_rows=2)
+v = array([[0, -1], [1, 0]]) @ w
 cut = float(input())
 
 n, m, d = map(int, input().split())
@@ -11,10 +16,13 @@ data  = loadtxt(sys.stdin).reshape(n + m, d)
 signal, noise = data[:n].T, data[n:].T
 
 figure()
+subplot(aspect='equal')
 scatter(*signal, c='xkcd:grey blue', label='signal')
 scatter(*noise,  c='xkcd:baby blue', label='noise')
-scatter(*(cut * w/np.dot(w,w)), c='red')
-arrow(*(-abs(w)), *4*abs(w))
+line(-20*w, 20*w, c='xkcd:blue', label='projection')
+line(w-10*v, w+10*v, c='xkcd:red', label='cut')
+xlim(-1.5, 8)
+ylim(-1.5, 8)
 legend()
 
 figure()