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Solve the following python programming problem given the following code:
def two_radar() : 
    import numpy as np 
    import matplotlib.pyplot as plt 
    from numpy import array 
    from numpy.linalg import norm 
    from numpy.random import randn 
    from math import atan2, radians 
    from filterpy.common import Q_discrete_white_noise 
    class RadarStation (object) : 
        def __init__(self, pos, range_std, bearing_std) : 
            self.pos = asarray (pos) 
            self.range_std = range_std 
            self.bearing_std = bearing_std 
def reading_of(self, ac_pos) : 
            ' Returns range and bearing to aircraft as tuple. bearing is in
            radians.
            ' 
            diff = np.subtract (self.pos, ac_pos) 
            rng = norm (diff) 
            brg = atan2 (diff [1], diff [0]) 
            return (rng, brg) 
def noisy_reading(self, ac_pos) : 
            (rng, brg) = self.reading_of (ac_pos) 
            rng += (randn () * self.range_std) 
            brg += (randn () * self.bearing_std) 
            return (rng, brg) 
class ACSim (object) : 
        def __init__(self, pos, vel, vel_std) : 
            self.pos = asarray (pos, dtype = float) 
            self.vel = asarray (vel, dtype = float) 
            self.vel_std = vel_std 
def update(self) : 
            vel = (self.vel + (randn () * self.vel_std)) 
            self.pos += vel 
            return self.pos 
dt = 1.0 
    def hx(x) : 
        (r1, b1) = hx.R1.reading_of ((x [0], x [2])) 
        (r2, b2) = hx.R2.reading_of ((x [0], x [2])) 
        return array ([r1, b1, r2, b2]) 
        pass 
def fx(x, dt) : 
        x_est = x.copy () 
        x_est [0] += (x [1] * dt) 
        x_est [2] += (x [3] * dt) 
        return x_est 
(vx, vy) = (0.1, 0.1) 
    f = UnscentedKalmanFilter (dim_x = 4, dim_z = 4, dt = dt, hx = hx, fx = fx, kappa = 0) 
    aircraft = ACSim ((100, 100), ((vx * dt), (vy * dt)), 2e-08) 
    range_std = 0.001 
    bearing_std = (1 / 1000) 
    R1 = RadarStation ((0, 0), range_std, bearing_std) 
    R2 = RadarStation ((200, 0), ms, bearing_std) 
    hx.R1 = R1 
  ...

    
    

    Fix the buggy line: R2 = RadarStation ((200, 0), ms, bearing_std)
assistant
#Here is Python program to fix the buggy line: R2 = RadarStation ((200, 0), ms, bearing_std)
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R2 = RadarStation ((200, 0), range_std, bearing_std)