Changes

<td> [[Image:fdtd_out36_tn.png|thumb|180px300px|Radiation pattern of a vertical dipole above PEC ground.]] </td><td> [[Image:fdtd_out37_tn.png|thumb|180px300px|Radiation pattern of a vertical dipole above PMC ground.]] </td></tr><tr><td> [[Image:fdtd_out38_tn.png|thumb|180px300px|Radiation pattern of a horizontal dipole above PEC ground.]] </td><td> [[Image:fdtd_out39_tn.png|thumb|180px300px|Radiation pattern of a horizontal dipole above PEC ground.]] </td>