function [angle_1,angle_2] = calc_angle_switch(idx,range,X,Y,Z)
  angle_1 = 0;
  angle_2 = 0;
  fitvars = polyfit(Y([idx-range:idx+range]), Z([idx-range:idx+range]), 1);
  m = fitvars(1)
  c = fitvars(2)
  angle_1 = atand(m)

  plot (Y([idx-range:idx+range]),Y([idx-range:idx+range]).*m+c);

end