0__k_x_E__B.jpg<br>
<P><img src="0__k_x_E__B.jpg"><br>
1-helmholtz-wavenumber.jpg<br>
<P><img src="1-helmholtz-wavenumber.jpg"><br>
2-complex_k.jpg<br>
<P><img src="2-complex_k.jpg"><br>
3-group-velocity-pulses.jpg<br>
<P><img src="3-group-velocity-pulses.jpg"><br>
4-group-velocity-envelope.jpg<br>
<P><img src="4-group-velocity-envelope.jpg"><br>
5-averaging-energy.jpg<br>
<P><img src="5-averaging-energy.jpg"><br>